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Computational exploration of α-lactone rearrangements and the cyclic halonium zwitterion from bromination of acrylate anion in water: Implicit vs. explicit solvation. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.131989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Tsuji Y, Richard JP. Formation and Mechanism for Reactions of Ring-Substituted Phenonium Ions in Aqueous Solution. J PHYS ORG CHEM 2016; 29:557-564. [PMID: 27812239 PMCID: PMC5087973 DOI: 10.1002/poc.3510] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The results of studies on the structure and reactivity of spiro[5.2]oct-5,7-diene-4yl carbocation [phenonium ion] have had a significant impact on the course of discussion about the distinction between classical and nonclassical carbocations. This minireview will present a brief overview of the structure, bonding and reactivity of ring substituted phenonium ions (X-4+), with an emphasis on work completed since 2004. The discussion will focus on the development of new experimental protocol for determination of the selectivity for addition of nucleophilic anions to X-4+ in aqueous solution. The existing relationships between carbocation lifetime and nucleophilic selectivity, and the known lifetime of ca 140 sec for spiro[2.5]oct-4,7-diene-6-one provide rough estimates of the lifetimes for 4-Me-X-4+ and 4-MeO-X-4+ in aqueous solution. Evidence is presented that nucleophile addition to X-4+ proceeds through an "exploded" transition state, with relatively weak bonding the nucleophile and leaving group, and the development of significant positive charge at the reacting primary cyclopropyl carbon.
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Affiliation(s)
- Yutaka Tsuji
- Department of Biochemistry and Applied Chemistry, Kurume National College of Technology, Komorinomachi, Kurume 830-8555, Japan
| | - John P. Richard
- Department of Chemistry, University at Buffalo, SUNY, Buffalo, NY 14260, USA
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Li D, Williams NH. The solvolysis mechanism of simple secondary tosylates in 50% aqueous TFE. J PHYS ORG CHEM 2016. [DOI: 10.1002/poc.3559] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dian Li
- Department of Chemistry; University of Sheffield; Sheffield S3 7HF UK
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Zeng J, Liu KM, Duan XF. Selective Co/Ti Cooperatively Catalyzed Biaryl Couplings of Aryl Halides with Aryl Metal Reagents. Org Lett 2013; 15:5342-5. [DOI: 10.1021/ol402599f] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Jing Zeng
- College of Chemistry, Beijing Normal University, Beijing, 100875, China
| | - Kun Ming Liu
- College of Chemistry, Beijing Normal University, Beijing, 100875, China
| | - Xin Fang Duan
- College of Chemistry, Beijing Normal University, Beijing, 100875, China
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Benedetto E, Tredwell M, Hollingworth C, Khotavivattana T, Brown JM, Gouverneur V. Regio- and stereoretentive synthesis of branched, linear (E)- and (Z)-allyl fluorides from allyl carbonates under Ir-catalysis. Chem Sci 2013. [DOI: 10.1039/c2sc21789a] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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Pan X, Yu W, Ou W, Tao X, Wan J, Liu F. Synthesis of a Chiral β-Amino Acid Derivative by a Cobalt-Catalysed Coupling Reaction. JOURNAL OF CHEMICAL RESEARCH 2011. [DOI: 10.3184/174751911x13155906432537] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A chiral β-amino acid derivative was synthesised by a cobalt-catalysed alkylation of 2,4,5-trifluorophenyl magnesium bromide with the alkyl halide derivative of L-aspartic acid, using an efficient catalytic reagent: CoCl2/TMEDA. The halide derivative was synthesised from protected L-aspartic acid β-methyl ester and the Grignard reagent was made by bromine- magnesium exchange. The stereo-structure was well preserved from L-aspartic acid.
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Affiliation(s)
- Xianhua Pan
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, 120 Caobao Rd. Shanghai 200235, P. R. China
| | - Wansheng Yu
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, 120 Caobao Rd. Shanghai 200235, P. R. China
| | - Wenhua Ou
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, 120 Caobao Rd. Shanghai 200235, P. R. China
| | - Xiaohu Tao
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, 120 Caobao Rd. Shanghai 200235, P. R. China
| | - Jiaomei Wan
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, 120 Caobao Rd. Shanghai 200235, P. R. China
| | - Feng Liu
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, 120 Caobao Rd. Shanghai 200235, P. R. China
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Affiliation(s)
- Gérard Cahiez
- Department of Chemistry (FRE 3043), CNRS-Université de Paris 13, 74 Rue Marcel Cachin, F-93017 Bobigny, France.
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Teshima M, Tsuji Y, Richard JP. Dynamics for Reactions of Ion Pairs in Aqueous Solution: Reactivity of Tosylate Anion Ion Paired with the Highly Destabilized 1-(4-Methylphenyl)-2,2,2-Trifluoroethyl Carbocation. J PHYS ORG CHEM 2010; 23:730-734. [PMID: 21031146 DOI: 10.1002/poc.1642] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The sum of the rate constants for solvolysis and scrambling of carbon bridging and nonbridging oxygen-18 at 4-MeC(6)H(4)CH(CF(3))OS((18)O(2))Tos in 50/50 (v/v) trifluoroethanol/water, (k(solv) + k(iso)) = 5.4 × 10(-6) s(-1), is 50% larger than k(solv) = 3.6 × 10(-6) for the simple solvolysis reaction of the sulfonate ester. This shows that the ion pair intermediate of solvolysis undergoes significant internal return to form reactant. These data give a value of k(-1) = 1.7 × 10(10) s(-1) for internal return of the carbocation-anion pair to the substrate. This rate constant is larger than the value of k(-1) = 7 × 10(9) s(-1) reported for internal return of an ion pair between the 1-(4-methylphenyl)ethyl carbocation and pentafluorobenzoate anion to the neutral ester (4-MeC(6)H(4)CH(CH(3))O(2)CC(6)F(5)) in the same solvent. The partitioning of ion pairs to the 1-(4-methylphenyl)ethyl carbocation and to the highly destabilized 1-(4-methylphenyl)2,2,2-trifluoroethyl carbocation is compared and contrasted.
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Affiliation(s)
- Minami Teshima
- Department of Biochemistry and Applied Chemistry, Kurume National College of Technology, Komorinomachi, Kurume 830-8555, Japan
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Streidl N, Antipova A, Mayr H. Suppression of Common-Ion Return by Amines: A Method to Measure Rates of Fast SN1 Reactions. J Org Chem 2009; 74:7328-34. [DOI: 10.1021/jo901410b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nicolas Streidl
- Department Chemie und Biochemie der Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13 (Haus F), 81377 München, Germany
| | - Anna Antipova
- Department Chemie und Biochemie der Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13 (Haus F), 81377 München, Germany
| | - Herbert Mayr
- Department Chemie und Biochemie der Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13 (Haus F), 81377 München, Germany
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Alajarin M, Marin-Luna M, Ortin MM, Sanchez-Andrada P, Vidal A. Benzylic Newman–Kwart rearrangement of O-azidobenzyl thiocarbamates triggered by phosphines: pseudopericyclic [1,3] shifts via uncoupled concerted mechanisms. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.01.064] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Cahiez G, Chaboche C, Duplais C, Moyeux A. A New Efficient Catalytic System for the Chemoselective Cobalt-Catalyzed Cross-Coupling of Aryl Grignard Reagents with Primary and Secondary Alkyl Bromides. Org Lett 2008; 11:277-80. [DOI: 10.1021/ol802362e] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gérard Cahiez
- Department of Chemistry, CNRS - Université de Paris13, 74 Rue Marcel Cachin, F-93017 Bobigny, France
| | - Christophe Chaboche
- Department of Chemistry, CNRS - Université de Paris13, 74 Rue Marcel Cachin, F-93017 Bobigny, France
| | - Christophe Duplais
- Department of Chemistry, CNRS - Université de Paris13, 74 Rue Marcel Cachin, F-93017 Bobigny, France
| | - Alban Moyeux
- Department of Chemistry, CNRS - Université de Paris13, 74 Rue Marcel Cachin, F-93017 Bobigny, France
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Tantillo DJ. Recent excursions to the borderlands between the realms of concerted and stepwise: carbocation cascades in natural products biosynthesis. J PHYS ORG CHEM 2008. [DOI: 10.1002/poc.1320] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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