301
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Song JJ, Tan Z, Reeves JT, Yee NK, Senanayake CH. N-Heterocyclic Carbene-Catalyzed Mukaiyama Aldol Reactions. Org Lett 2007; 9:1013-6. [PMID: 17295498 DOI: 10.1021/ol0630494] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
N-Heterocyclic carbenes were shown to be highly effective catalysts to promote Mukaiyama aldol reactions. In the presence of only 0.5 mol % of N-heterocyclic carbene (5), various aldehydes and 2,2,2-trifluoroacetophenone underwent Mukaiyama aldol reactions in THF with trimethylsilyl ketene acetal (2) at 23 degrees C as well as with trimethylsilyl enol ether (7) at 0 degrees C to afford aldol adducts in good yields. These conditions are extremely mild and operationally simple and tolerate various functional groups. [reaction: see text]
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Affiliation(s)
- Jinhua J Song
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, CT 06877-0368, USA.
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302
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Cattoën X, Gornitzka H, Tham FS, Miqueu K, Bourissou D, Bertrand G. Transient Amino-Hydrazino-Carbenes: A Radical Pathway for Intramolecular 1,2-Migration Reactions. European J Org Chem 2007. [DOI: 10.1002/ejoc.200600901] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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303
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Church TL, Getzler YDYL, Byrne CM, Coates GW. Carbonylation of heterocycles by homogeneous catalysts. Chem Commun (Camb) 2007:657-74. [PMID: 17392950 DOI: 10.1039/b613476a] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This article summarizes the recent developments (particularly the uses of homogeneous organometallic catalysts) in ring-opening carbonylations, ring-opening carbonylative polymerizations and ring-expansion carbonylations of heterocycles such as epoxides, aziridines, lactones and oxazolines.
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Affiliation(s)
- Tamara L Church
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, NY 14853, USA
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304
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Nederberg F, Lohmeijer BGG, Leibfarth F, Pratt RC, Choi J, Dove AP, Waymouth RM, Hedrick JL. Organocatalytic Ring Opening Polymerization of Trimethylene Carbonate. Biomacromolecules 2007; 8:153-60. [PMID: 17206801 DOI: 10.1021/bm060795n] [Citation(s) in RCA: 255] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A variety of organocatalysts has been surveyed in the ring opening polymerization of trimethylene carbonate. Excellent control was found for several of these catalysts yielding well-defined polycarbonates with molecular weights up to 50,000 g mol(-1), polydispersities below 1.08, and high end-group fidelity. Melt or bulk polymerization was accomplished without loss of control of molecular weight or polydispersity, and random ester-carbonate bulk polymerizations were also demonstrated. Furthermore, by combining disparate polymerization techniques using bifunctional initiators, the mild polymerization conditions allow for the preparation of new block copolymers. Hydrogen-bond activation of monomer and initiator/propagating species is proposed as the underlying mechanism, which can be tuned to mitigate adverse side reactions.
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Affiliation(s)
- Fredrik Nederberg
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
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305
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Chisholm MH, Gallucci JC, Yin H. 18-Membered cyclic esters derived from glycolide and lactide: preparations, structures and coordination to sodium ions. Dalton Trans 2007:4811-21. [DOI: 10.1039/b709081a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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306
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Schmidt MA, Movassaghi M. Synthesis of optically active imidazopyridinium salts and the corresponding NHCs. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2006.10.157] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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307
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Rodriguez M, Marrot S, Kato T, Stérin S, Fleury E, Baceiredo A. Catalytic activity of N-heterocyclic carbenes in ring opening polymerization of cyclic siloxanes. J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2006.10.006] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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308
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Coulembier O, Degée P, Hedrick JL, Dubois P. From controlled ring-opening polymerization to biodegradable aliphatic polyester: Especially poly(β-malic acid) derivatives. Prog Polym Sci 2006. [DOI: 10.1016/j.progpolymsci.2006.08.004] [Citation(s) in RCA: 251] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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309
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Samantaray MK, Katiyar V, Roy D, Pang K, Nanavati H, Stephen R, Sunoj RB, Ghosh P. A Cationic (N-Heterocyclic carbene)silver Complex as Catalyst for Bulk Ring-Opening Polymerization ofL-Lactides. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600209] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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310
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Coulembier O, Lohmeijer BGG, Dove AP, Pratt RC, Mespouille L, Culkin DA, Benight SJ, Dubois P, Waymouth RM, Hedrick JL. Alcohol Adducts of N-Heterocyclic Carbenes: Latent Catalysts for the Thermally-Controlled Living Polymerization of Cyclic Esters. Macromolecules 2006. [DOI: 10.1021/ma0611366] [Citation(s) in RCA: 124] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Olivier Coulembier
- Laboratory of Polymeric and Composite Materials (LPCM), University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, and Stanford University, Department of Chemistry, Stanford, California 94305
| | - Bas G. G. Lohmeijer
- Laboratory of Polymeric and Composite Materials (LPCM), University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, and Stanford University, Department of Chemistry, Stanford, California 94305
| | - Andrew P. Dove
- Laboratory of Polymeric and Composite Materials (LPCM), University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, and Stanford University, Department of Chemistry, Stanford, California 94305
| | - Russell C. Pratt
- Laboratory of Polymeric and Composite Materials (LPCM), University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, and Stanford University, Department of Chemistry, Stanford, California 94305
| | - Laetitia Mespouille
- Laboratory of Polymeric and Composite Materials (LPCM), University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, and Stanford University, Department of Chemistry, Stanford, California 94305
| | - Darcy A. Culkin
- Laboratory of Polymeric and Composite Materials (LPCM), University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, and Stanford University, Department of Chemistry, Stanford, California 94305
| | - Stephanie J. Benight
- Laboratory of Polymeric and Composite Materials (LPCM), University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, and Stanford University, Department of Chemistry, Stanford, California 94305
| | - Philippe Dubois
- Laboratory of Polymeric and Composite Materials (LPCM), University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, and Stanford University, Department of Chemistry, Stanford, California 94305
| | - Robert M. Waymouth
- Laboratory of Polymeric and Composite Materials (LPCM), University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, and Stanford University, Department of Chemistry, Stanford, California 94305
| | - James L. Hedrick
- Laboratory of Polymeric and Composite Materials (LPCM), University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium, IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, and Stanford University, Department of Chemistry, Stanford, California 94305
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311
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Abstract
[reaction: see text] An N-heterocyclic carbene promotes the rearrangement of alpha-amino acid derived O-acyl carbonates to their corresponding C-acylated isomers, generating a C-C bond and a quaternary stereocenter with high efficiency, under mild reaction conditions and with low catalyst loadings.
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Affiliation(s)
- Jennifer E Thomson
- EaStChem, School of Chemistry and Centre for Biomolecular Sciences, University of St Andrews, North Haugh, St Andrews, KY16 9ST, UK
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312
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Biela T, Kowalski A, Libiszowski J, Duda A, Penczek S. Progress in Polymerization of Cyclic Esters: Mechanisms and Synthetic Applications. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/masy.200650807] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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313
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Dove AP, Pratt RC, Lohmeijer BG, Culkin DA, Hagberg EC, Nyce GW, Waymouth RM, Hedrick JL. N-Heterocyclic carbenes: Effective organic catalysts for living polymerization. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.02.037] [Citation(s) in RCA: 123] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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314
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Liu YK, Li R, Yue L, Li BJ, Chen YC, Wu Y, Ding LS. Unexpected Ring-Opening Reactions of Aziridines with Aldehydes Catalyzed by Nucleophilic Carbenes under Aerobic Conditions. Org Lett 2006; 8:1521-4. [PMID: 16597100 DOI: 10.1021/ol0529905] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] The chemoselective ring opening of N-tosyl aziridines with aldehydes catalyzed by an N-heterocyclic carbene was investigated under aerobic conditions. Unexpected carboxylates of 1,2-amino alcohols from the corresponding aldehydes, rather than the acyl anion ring-opened beta-amino ketones, were exclusively obtained. A plausible mechanism for this unprecedented carbene-mediated reaction was also proposed.
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Affiliation(s)
- Yan-Kai Liu
- Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
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315
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Persson PV, Casas J, Iversen T, Córdova A. Direct Organocatalytic Chemoselective Synthesis of a Dendrimer-like Star Polyester. Macromolecules 2006. [DOI: 10.1021/ma0521710] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Per Valdemar Persson
- STFI-Packforsk AB, P.O. Box 5604, SE-114 86 Stockholm, Sweden, and Department of Organic Chemistry, The Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jesús Casas
- STFI-Packforsk AB, P.O. Box 5604, SE-114 86 Stockholm, Sweden, and Department of Organic Chemistry, The Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Tommy Iversen
- STFI-Packforsk AB, P.O. Box 5604, SE-114 86 Stockholm, Sweden, and Department of Organic Chemistry, The Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Armando Córdova
- STFI-Packforsk AB, P.O. Box 5604, SE-114 86 Stockholm, Sweden, and Department of Organic Chemistry, The Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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316
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Movassaghi M, Schmidt MA. N-heterocyclic carbene-catalyzed amidation of unactivated esters with amino alcohols. Org Lett 2006; 7:2453-6. [PMID: 15932221 DOI: 10.1021/ol050773y] [Citation(s) in RCA: 232] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] A catalytic amidation of unactivated esters with amino alcohols is described. A series of solution studies in addition to the first X-ray structure of a carbene-alcohol complex support a carbene-base nucleophile activation mechanism.
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Affiliation(s)
- Mohammad Movassaghi
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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317
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Song JJ, Gallou F, Reeves JT, Tan Z, Yee NK, Senanayake CH. Activation of TMSCN by N-Heterocyclic Carbenes for Facile Cyanosilylation of Carbonyl Compounds. J Org Chem 2006; 71:1273-6. [PMID: 16438554 DOI: 10.1021/jo052206u] [Citation(s) in RCA: 174] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
N-Heterocyclic carbenes were found to be highly effective organocatalysts in activating TMSCN for facile cyanosilylation of carbonyl compounds. Cyano transfer from TMSCN to aldehydes and ketones proceeds at room temperature in the presence of only 0.01-0.5 mol % of N-heterocyclic carbene (1), leading to a range of trimethylsilylated cyanohydrins in very good to excellent yields. These conditions are extremely mild and simple and tolerate various functional groups.
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Affiliation(s)
- Jinhua J Song
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Old Ridgebury Road, P.O. Box 368, Ridgefield, CT 06877-0368, USA.
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318
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Fürstner A, Alcarazo M, César V, Lehmann CW. Convenient, scalable and flexible method for the preparation of imidazolium salts with previously inaccessible substitution patterns. Chem Commun (Camb) 2006:2176-8. [PMID: 16703146 DOI: 10.1039/b604236h] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A high yielding and modular approach to N,N'-disubstituted imidazolium salts is described, providing access to substitution patterns that are beyond the reach of established methodology.
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Affiliation(s)
- Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, D-45470, Mülheim/Ruhr, Germany.
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319
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Singh R, Nolan SP. N-Heterocyclic carbenes: Advances in transition metal and organic catalysis. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b515102n] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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320
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Fukuda Y, Maeda Y, Kondo K, Aoyama T. Cyano-Phosphorylation of Aldehydes Catalyzed by a Nucleophilic N-Heterocyclic Carbene. Chem Pharm Bull (Tokyo) 2006; 54:397-8. [PMID: 16508201 DOI: 10.1248/cpb.54.397] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The first method for cyano-phosphorylation of aldehydes with diethyl cyanophosphonate in the presence of N-heterocyclic carbene prepared from 1,3-bis(2,4,6-trimethylphenyl)imidazolium chloride and KOt-Bu, as a nucleophilic catalyst, is described.
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Affiliation(s)
- Yoshimasa Fukuda
- Graduate School of Pharmaceutical Sciences, Nagoya City University, Tanabe-dori, Japan
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321
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Patel D, Liddle ST, Mungur SA, Rodden M, Blake AJ, Arnold PL. Bifunctional yttrium(iii) and titanium(iv) NHC catalysts for lactide polymerisation. Chem Commun (Camb) 2006:1124-6. [PMID: 16514460 DOI: 10.1039/b514406j] [Citation(s) in RCA: 140] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lewis acidic yttrium(III) and titanium(IV) derivatives of anionic, metal-tethered carbenes apparently act as bifunctional catalysts for the polymerisation of D,L-lactide, using a combination of Lewis acid and base functionalities to initiate ring opening of the cyclic monomer; the alcohol- and amino-functionalised carbenes from which they derive provide models for the first insertion step, and also display metal-free polymerisation catalysis to generate polylactic acid.
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Affiliation(s)
- Dipti Patel
- University of Nottingham, University Park, Nottingham, UK
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322
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Jensen TR, Schaller CP, Hillmyer MA, Tolman WB. Zinc N-heterocyclic carbene complexes and their polymerization of d,l-lactide. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2005.07.070] [Citation(s) in RCA: 118] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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323
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Arnold PL, Blake AJ, Wilson C. Synthesis and Small Molecule Reactivity of Uranium(IV) Alkoxide Complexes with both Bound and Pendant N-heterocyclic Carbene Ligands. Chemistry 2005; 11:6095-9. [PMID: 16052659 DOI: 10.1002/chem.200500481] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The syntheses of two tetravalent uranium alkoxide-carbene complexes are reported, [UIL3], and [UL4] where L = OCMe2CH2[1-C(NCHCHNiPr)]. The latter shows dynamic behaviour of the alkoxycarbene ligands in solution at room temperature, and the crystal structure of [UL4] shows that one carbene group remains uncoordinated. The unbound N-heterocyclic carbene group is trapped by a range of reagents such as 16-valence-electron metal carbonyl fragments and BH3 moieties, forming, for example, [UL3(mu-L)W(CO)5], [UL2(mu-L)2Mo(CO)4], and [UL(n)(L-BH3)(4-n)] (n = 1-4), demonstrating the potential for these hemilabile electropositive metal-carbene complexes to participate in the bifunctional activation of small molecules.
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Affiliation(s)
- Polly L Arnold
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
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324
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Ma C, Ding H, Wu G, Yang Y. Facile Synthesis of Highly Substituted 3-Aminofurans from Thiazolium Salts, Aldehydes, and Dimethyl Acetylenedicarboxylate. J Org Chem 2005; 70:8919-23. [PMID: 16238328 DOI: 10.1021/jo051513x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
[reaction: see text] A facile preparation of 3-aminofuran derivatives via multicomponent reactions of thiazole carbenes, aldehydes, and dimethyl acetylenedicarboxylate (DMAD) is reported. In this process, the thiazole carbenes, generated in situ from thiazolium salts, reacted with aldehydes and DMAD at -78 to 0 degree C in CH(2)Cl(2) to afford the substituted furans in moderate to good yields. Eight substituted thiazolium salts were employed as carbene precursors in the reaction. Besides aryl aldehydes, alpha,beta-unsaturated aldehydes, aliphatic aldehydes, and arenedial were also investigated and found to be applicable to this reaction.
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Affiliation(s)
- Cheng Ma
- Department of Chemistry, Zhejiang University, Hangzhou, China.
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325
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Lai CL, Lee HM, Hu CH. Theoretical study on the mechanism of N-heterocyclic carbene catalyzed transesterification reactions. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.07.046] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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326
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Dechy-Cabaret O, Martin-Vaca B, Bourissou D. Controlled ring-opening polymerization of lactide and glycolide. Chem Rev 2005; 104:6147-76. [PMID: 15584698 DOI: 10.1021/cr040002s] [Citation(s) in RCA: 1783] [Impact Index Per Article: 93.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Odile Dechy-Cabaret
- Laboratoire Hétérochimie Fondamentale et Appliquée du CNRS (UMR 5069), Université Paul Sabatier, 118, route de Narbonne, 31062 Toulouse Cedex 04, France
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327
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Song JJ, Tan Z, Reeves JT, Gallou F, Yee NK, Senanayake CH. N-Heterocyclic Carbene Catalyzed Trifluoromethylation of Carbonyl Compounds. Org Lett 2005; 7:2193-6. [PMID: 15901167 DOI: 10.1021/ol050568i] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text]. A novel N-heterocyclic carbene (NHC) catalyzed trifluoromethylation reaction of carbonyl compounds was discovered. Both enolizable and nonenolizable aldehydes and alpha-keto esters undergo facile trifluoromethylation with TMSCF3 at room temperature in the presence of only 0.5-1 mol % of the commercially available NHC (1), providing CF3-substituted alcohols in good yields. Selective trifluoromethylation of aldehydes over ketones can be achieved under NHC catalysis. These conditions are mild and simple and tolerate a variety of functional groups.
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Affiliation(s)
- Jinhua J Song
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368, USA.
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328
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Kim MS, Seo KS, Khang G, Lee HB. Ring-Opening Polymerization of?-Caprolactone by Poly(ethylene glycol) by an Activated Monomer Mechanism. Macromol Rapid Commun 2005. [DOI: 10.1002/marc.200400650] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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329
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Kano T, Sasaki K, Maruoka K. Enantioselective Acylation of Secondary Alcohols Catalyzed by Chiral N-Heterocyclic Carbenes. Org Lett 2005; 7:1347-9. [PMID: 15787503 DOI: 10.1021/ol050174r] [Citation(s) in RCA: 155] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] The synthetic utility of chiral N-heterocyclic carbenes, which have been used mainly in transition metal-catalyzed reactions as a ligand, was demonstrated by the enantioselective acylation of secondary alcohols.
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Affiliation(s)
- Taichi Kano
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
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330
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Báez JE, Martínez-Richa A, Marcos-Fernández A. One-Step Route to α-Hydroxyl-ω-(carboxylic acid) Polylactones Using Catalysis by Decamolybdate Anion. Macromolecules 2005. [DOI: 10.1021/ma0491098] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- José E. Báez
- Facultad de Química, Universidad de Guanajuato, Noria Alta S/N, 36050 Guanajuato, Gto. México
| | - Antonio Martínez-Richa
- Facultad de Química, Universidad de Guanajuato, Noria Alta S/N, 36050 Guanajuato, Gto. México
| | - Angel Marcos-Fernández
- Departamento de Química y Tecnología de Elastómeros, Instituto de Ciencia y Tecnología de Polímeros (CSIC), C/Juan de la Cierva No. 3, 28006 Madrid, Spain
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331
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Hafrén J, Córdova A. Direct Organocatalytic Polymerization from Cellulose Fibers. Macromol Rapid Commun 2005. [DOI: 10.1002/marc.200400470] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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332
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Díez-González S, Nolan SP. 8 Carbene and transition metal-mediated transformations. ACTA ACUST UNITED AC 2005. [DOI: 10.1039/b418971j] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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333
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Singh R, Nolan SP. Synthesis of phosphorus esters by transesterification mediated by N-heterocyclic carbenes (NHCs). Chem Commun (Camb) 2005:5456-8. [PMID: 16261245 DOI: 10.1039/b509783e] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The versatile nucleophilic organic catalysts N-heterocyclic carbenes (NHCs) have been shown to effectively mediate the transesterification of phosphorus esters under mild conditions; user-friendly imidazolium salts can also be employed as pre-catalysts.
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Affiliation(s)
- Rohit Singh
- Department of Chemistry, University of New Orleans, New Orleans, LA 70148, USA
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334
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Wang JL, Wang L, Dong CM. Synthesis, crystallization, and morphology of star-shaped poly(ɛ-caprolactone). ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pola.20954] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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335
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336
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Effect of microwave energy on chain propagation of poly(ε-caprolactone) in benzoic acid-initiated ring opening polymerization of ε-caprolactone. Eur Polym J 2004. [DOI: 10.1016/j.eurpolymj.2004.05.007] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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337
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Persson PV, Schröder J, Wickholm K, Hedenström E, Iversen T. Selective Organocatalytic Ring-Opening Polymerization: A Versatile Route to Carbohydrate-Functionalized Poly(ε-caprolactones). Macromolecules 2004. [DOI: 10.1021/ma049562j] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Per Valdemar Persson
- STFI, Swedish Pulp and Paper Research Institute, Box 5604, SE-114 86 Stockholm, Sweden, and Chemistry, Department of Natural and Environmental Sciences, Mid Sweden University, SE-851 70 Sundsvall, Sweden
| | - Jessica Schröder
- STFI, Swedish Pulp and Paper Research Institute, Box 5604, SE-114 86 Stockholm, Sweden, and Chemistry, Department of Natural and Environmental Sciences, Mid Sweden University, SE-851 70 Sundsvall, Sweden
| | - Kristina Wickholm
- STFI, Swedish Pulp and Paper Research Institute, Box 5604, SE-114 86 Stockholm, Sweden, and Chemistry, Department of Natural and Environmental Sciences, Mid Sweden University, SE-851 70 Sundsvall, Sweden
| | - Erik Hedenström
- STFI, Swedish Pulp and Paper Research Institute, Box 5604, SE-114 86 Stockholm, Sweden, and Chemistry, Department of Natural and Environmental Sciences, Mid Sweden University, SE-851 70 Sundsvall, Sweden
| | - Tommy Iversen
- STFI, Swedish Pulp and Paper Research Institute, Box 5604, SE-114 86 Stockholm, Sweden, and Chemistry, Department of Natural and Environmental Sciences, Mid Sweden University, SE-851 70 Sundsvall, Sweden
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338
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Fonseca MH, List B. Combinatorial chemistry and high-throughput screening for the discovery of organocatalysts. Curr Opin Chem Biol 2004; 8:319-26. [PMID: 15183331 DOI: 10.1016/j.cbpa.2004.04.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
In recent years, interest in organocatalysis, the catalysis with small organic molecules, has been revitalized. Independently, high-throughput-screening and combinatorial chemistry became practical methodologies in the discovery of novel catalytic entities. The logical extension of these methodologies to organocatalysis has led to several interesting results, which are highlighted in this review.
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Affiliation(s)
- María Hechavarría Fonseca
- Max Planck Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Muelheim an der Ruhr, Germany
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339
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Liu J, Liu L. Ring-Opening Polymerization of ε-Caprolactone Initiated by Natural Amino Acids. Macromolecules 2004. [DOI: 10.1021/ma0348066] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jiyan Liu
- Department of Polymer Science, College of Chemistry and Molecular Science, Wuhan University, Key Laboratory of Biomedical Polymers (Wuhan University), Ministry of Education, Wuhan 430072, China
| | - Lijian Liu
- Department of Polymer Science, College of Chemistry and Molecular Science, Wuhan University, Key Laboratory of Biomedical Polymers (Wuhan University), Ministry of Education, Wuhan 430072, China
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340
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Lee JT, Alper H. Alternating Copolymerization of Propylene Oxide and Carbon Monoxide to form Aliphatic Polyesters. Macromolecules 2004. [DOI: 10.1021/ma030419k] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jong Tae Lee
- Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, Ontario, Canada K1N 6N5
| | - Howard Alper
- Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, Ontario, Canada K1N 6N5
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341
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Li H, Wang C, Yue J, Zhao X, Bai F. Living ring-opening polymerization of lactides catalyzed by guanidinium acetate. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/pola.20275] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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342
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Nederberg F, Bowden T, Hilborn J. Synthesis, Characterization, and Properties of Phosphoryl Choline Functionalized Poly ε-caprolactone and Charged Phospholipid Analogues. Macromolecules 2003. [DOI: 10.1021/ma035433b] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fredrik Nederberg
- Uppsala University, Materials Chemistry, Polymer Chemistry, Box 538, S-751 21 Uppsala, Sweden
| | - Tim Bowden
- Uppsala University, Materials Chemistry, Polymer Chemistry, Box 538, S-751 21 Uppsala, Sweden
| | - Jöns Hilborn
- Uppsala University, Materials Chemistry, Polymer Chemistry, Box 538, S-751 21 Uppsala, Sweden
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343
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Zhao C, Wang D, Phillips DL. Theoretical Study of Samarium (II) Carbenoid (ISmCH2I) Promoted Cyclopropanation Reactions with Ethylene and the Effect of THF Solvent on the Reaction Pathways. J Am Chem Soc 2003; 125:15200-9. [PMID: 14653755 DOI: 10.1021/ja030280t] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A computational study of the cyclopropanation reactions of divalent samarium carbenoid ISmCH(2)I with ethylene is presented. The reaction proceeds through two competing pathways: methylene transfer and carbometalation. The ISmCH(2)I species was found to have a "samarium carbene complex" character with properties similar to previously investigated lithium carbenoids (LiCH(2)X where X = Cl, Br, I). The ISmCH(2)I carbenoid was found to be noticeably different in structure with more electrophilic character and higher chemical reactivity than the closely related classical Simmons-Smith (IZnCH(2)I) carbenoid. The effect of THF solvent was investigated by explicit coordination of the solvent THF molecules to the Sm (II) center in the carbenoid. The ISmCH(2)I/(THF)(n)() (where n = 0, 1, 2) carbenoid methylene transfer pathway barriers to reaction become systematically lower as more THF solvent is added (from 12.9 to 14.5 kcal/mol for no THF molecules to 8.8 to 10.7 kcal/mol for two THF molecules). In contrast, the reaction barriers for cyclopropanation via the carbometalation pathway remain high (>15 kcal/mol). The computational results are briefly compared to other carbenoid reactions and related species.
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Affiliation(s)
- Cunyuan Zhao
- Contribution from the Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
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344
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Granick S, Kumar SK, Amis EJ, Antonietti M, Balazs AC, Chakraborty AK, Grest GS, Hawker C, Janmey P, Kramer EJ, Nuzzo R, Russell TP, Safinya CR. Macromolecules at surfaces: Research challenges and opportunities from tribology to biology. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/polb.10669] [Citation(s) in RCA: 144] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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345
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Nyce GW, Glauser T, Connor EF, Möck A, Waymouth RM, Hedrick JL. In situ generation of carbenes: a general and versatile platform for organocatalytic living polymerization. J Am Chem Soc 2003; 125:3046-56. [PMID: 12617671 DOI: 10.1021/ja021084+] [Citation(s) in RCA: 256] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A metal-free, organocatalytic approach to living polymerization using N-heterocyclic carbenes as nucleophilic catalysts generated and used in situ in a single-pot process is detailed. The N-heterocyclic carbene catalyst platform is extremely versatile, as the nature of the substituents has a pronounced effect of catalyst stability and activity toward different substrates. The generation of imidazolium- and thiazaolium-based carbenes was accomplished from the reaction of the corresponding salts with the appropriate bases. This allowed the rapid screening of libraries of catalysts that provided a basic understanding of catalyst structure (sterics, electronics, etc.) with the polymerization rate, control, substrate, and range of molecular weights. The imidazole-based catalysts were significantly more active toward ROP than the thiazolium-based analogues. No appreciable differences between imidazol-2-ylidene and imidazolin-2-ylidene catalysts were observed. Less sterically demanding carbenes were found to be more active toward ring-opening polymerization (ROP) than their sterically encumbered analogues for lactone polymerization. These data prompted the investigation of ionic liquid as a precatalyst reservoir in a phase-transfer polymerization with an immiscible THF solution of monomer and initiator. In situ activation of the ionic liquid generates carbene that migrates to the organic phase effecting living ROP. Precatalyst (ionic liquid) regeneration terminates polymerization. This simple reaction/recycle protocol readily allows repetitive ROPs from the ionic liquid using commercially available materials.
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Affiliation(s)
- Gregory W Nyce
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
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346
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Nair V, Bindu S, Sreekumar V, Rath NP. Unprecedented reactivity of N-heterocyclic carbenes toward DMAD and aldehydes leading to novel multicomponent reactions. Org Lett 2003; 5:665-7. [PMID: 12605485 DOI: 10.1021/ol0273856] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A facile synthesis of highly functionalized 2-oxymaleate and furanone derivatives by the multicomponent reaction of 1,3-dimesityl imidazolin-2-ylidene/imidazol-2-ylidene, DMAD, and aldehydes is described.
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Affiliation(s)
- Vijay Nair
- Organic Chemistry Division, Regional Research Laboratory (CSIR), Trivandrum, India, USA.
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347
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Marcilla R, Alberto Blazquez J, Rodriguez J, Pomposo JA, Mecerreyes D. Tuning the solubility of polymerized ionic liquids by simple anion-exchange reactions. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/pola.11015] [Citation(s) in RCA: 303] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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