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Kim S, Kim S, Otsuka N, Ryu I. Tin-Free Radical Carbonylation: Thiol Ester Synthesis Using Alkyl Allyl Sulfone Precursors, Phenyl Benzenethiosulfonate, and CO. Angew Chem Int Ed Engl 2005; 44:6183-6. [PMID: 16134186 DOI: 10.1002/anie.200501606] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sangmo Kim
- Center for Molecular Design & Synthesis, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
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52
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Matsubara H, Ryu I, Schiesser CH. Theoretical Study on the Isomerization Behavior between α,β-Unsaturated Acyl Radicals and α-Ketenyl Radicals. J Org Chem 2005; 70:3610-7. [PMID: 15844998 DOI: 10.1021/jo047868i] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Ab initio calculations using 6-311G**, cc-pVDZ, aug-cc-pVDZ, and a (valence) double-zeta pseudopotential (DZP) basis set, with (QCISD, CCSD(T)) and without (UHF) the inclusion of electron correlation, and density functional methods (BHandHLYP, B3LYP) predict that alpha,beta-unsaturated acyl radicals and alpha-ketenyl radicals exist as isomers. At the CCSD(T)/cc-pVDZ//BHandHLY/cc-pVDZ level of theory, energy barriers of 15.1 and 17.7-21.7 kJ mol(-)(1) are calculated for the isomerization of s-trans-propenoyl and s-trans-crotonoyl radical to ketenylmethyl and 1-ketenylethyl radical, respectively. Similar results are obtained for the reactions of s-trans isomers involving silyl, germyl, and stannyl groups with energy barriers (DeltaE++) of 12.2-12.4, 13.1-13.9, and 12.9-18.2 kJ mol(-)(1) at the CCSD(T)/DZP//BHandHLYP/DZP calculation, respectively. These results suggest that alpha,beta-unsaturated acyl radicals and alpha-ketenyl radicals are not canonical forms but are isomeric species that can rapidly interconvert.
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Affiliation(s)
- Hiroshi Matsubara
- Department of Chemistry, Faculty of Arts and Sciences, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
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Hayes CJ, Herbert NMA, Harrington-Frost NM, Pattenden G. α,β-Unsaturated and cyclopropyl acyl radicals, and their ketene alkyl radical equivalents. Ring synthesis and tandem cyclisation reactions. Org Biomol Chem 2005; 3:316-27. [PMID: 15632975 DOI: 10.1039/b413815p] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of the alpha,beta-unsaturated selenyl esters 12 and 14 with Bu(3)SnH-AIBN produces the corresponding 2-cyclohexenones 13 and 15 respectively via presumed alpha-ketene alkyl radical intermediates, viz. 10. By contrast, the 2,7-diene esters 34 and 39 undergo tandem radical cyclisations producing diquinanes, e.g.(76%), and the corresponding allene-substituted alpha,beta-unsaturated selenyl ester 48 gives the cyclooctadienone 56 on treatment with Bu(3)SnH-AIBN in refluxing benzene. The selenyl ester 19 derived from chrysanthemic acid produces a mixture of the gamma,delta-unsaturated aldehyde 22 and the corresponding dimer 25a on treatment with Bu(3)SnH-AIBN. Furthermore, in the presence of methanol the only product from this reaction was the bis(methyl ester) dimer 25b, thereby lending further credence to the involvement of ketene alkyl radical intermediates in these reactions, and in the aforementioned reactions involving 2,6- and 2,7-diene selenyl esters. Treatment of the cyclopropane selenyl esters and , containing keto- and oxy-group functionality in their side-chains, with Bu(3)SnH-AIBN led to excellent syntheses of the enol lactone 66 (76%) and the trans-fused bicyclo[6.1.0]nonane 67 (80-95%) respectively.
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Affiliation(s)
- Christopher J Hayes
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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55
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Majumdar KC, Basu PK, Mukhopadhyay PP. Formation of five- and six-membered heterocyclic rings under radical cyclisation conditions. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.05.001] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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56
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Ericsson C, Engman L. Microwave-Assisted Group-Transfer Cyclization of Organotellurium Compounds. J Org Chem 2004; 69:5143-6. [PMID: 15255754 DOI: 10.1021/jo040155f] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Primary- and secondary-alkyl aryl tellurides, prepared by arenetellurolate ring-opening of epoxides/ O-allylation, were found to undergo rapid (3-10 min) group-transfer cyclization to afford tetrahydrofuran derivatives in 60-74% yield when heated in a microwave cavity at 250 degrees C in ethylene glycol or at 180 degrees C in water. To go to completion, similar transformations had previously required extended photolysis in refluxing benzene containing a substantial amount of hexabutylditin. The only drawback of the microwave-assisted process was the loss in diastereoselectivity which is a consequence of the higher reaction temperature. Substitution in the Te-aryl moiety of the secondary-alkyl aryl tellurides (4-OMe, 4-H, 4-CF(3)) did not affect the outcome of the group-transfer reaction in ethylene glycol. However, at lower temperature, using water as a solvent, the CF(3) derivative failed to react. The microwave-assisted group-transfer cyclization was extended to benzylic but not to primary- and secondary-alkyl phenyl selenides.
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Affiliation(s)
- Cecilia Ericsson
- Uppsala University, Department of Chemistry, Organic Chemistry, Box 599, SE-751 24 Uppsala, Sweden
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57
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Kinetic parameters for radical reductions involving chiral nonracemic (1R,2S,5R)-menthyl substituted stannanes. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.tetasy.2004.01.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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58
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Wu Y, Yang L, Cui X, Du C, Zhu Y. Synthesis of novel chiral tellurium complexes by redox reaction of planar chiral cyclomercurated ferrocenylimines with tellurium powder and X-ray crystal structure of [TeCl{C5H5FeC5H3C(CH3)N-C6H4-4-CH3}]. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0957-4166(03)00163-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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59
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Yamago S, Hashidume M, Yoshida JI. A new synthetic route to substituted quinones by radical-mediated coupling of organotellurium compounds with quinones. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00784-6] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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60
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Braslau R, Anderson MO, Rivera F, Jimenez A, Haddad T, Axon JR. Acyl hydrazines as precursors to acyl radicals. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00490-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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61
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Yamago S, Miyoshi M, Miyazoe H, Yoshida J. Convergent Synthesis of Silylated Allylic Alcohols by a Stereoselective Domino, Sequential Radical-Coupling Reaction. Angew Chem Int Ed Engl 2002; 41:1407-9. [DOI: 10.1002/1521-3773(20020415)41:8<1407::aid-anie1407>3.0.co;2-z] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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62
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Yamago S, Iida K, Yoshida Ji JI. Organotellurium compounds as novel initiators for controlled/living radical polymerizations. Synthesis of functionalized polystyrenes and end-group modifications. J Am Chem Soc 2002; 124:2874-5. [PMID: 11902869 DOI: 10.1021/ja025554b] [Citation(s) in RCA: 218] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Polymer-end mimetic organotellurium compounds initiate controlled/living radical polymerization of styrene derivatives that allows accurate molecular weight control with defined end-groups. Transformations of the end-groups via radical and ionic reactions provide a variety of end-group modified polystyrenes.
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Affiliation(s)
- Shigeru Yamago
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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Kim S, Song HJ, Choi TL, Yoon JY. Tin-Free Radical Acylation Reactions with Methanesulfonyl Oxime Ether. Angew Chem Int Ed Engl 2001; 40:2524-2526. [DOI: 10.1002/1521-3773(20010702)40:13<2524::aid-anie2524>3.0.co;2-4] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2001] [Indexed: 11/10/2022]
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66
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Yamago S, Iida K, Yoshida JI. A new, practical synthesis of organotellurium compounds from organic halides and silyl tellurides. Remarkable effects of polar solvents and leaving groups. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00931-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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67
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Yamago S, Miyazoe H, Goto R, Hashidume M, Sawazaki T, Yoshida J. Synthetic and theoretical studies on group-transfer imidoylation of organotellurium compounds. remarkable reactivity of isonitriles in comparison with carbon monoxide in radical-mediated reactions. J Am Chem Soc 2001; 123:3697-705. [PMID: 11457101 DOI: 10.1021/ja003879r] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Imidoylation of organotellurium compounds with isonitriles has been investigated in conjunction with the radical-mediated C1 homologation reaction by using CO and isonitriles. Carbon-centered radicals generated photochemically or thermally from organotellurium compounds react with isonitriles in a group-transfer manner to give the corresponding imidoylated products. Organotellurium compounds have been found to serve as effective precursors of a wide variety of stabilized radicals, namely benzyl, alpha-alkoxy, alpha-amino, and acyl radicals, which take part in the imidoylation with high efficiency. The reactions are compatible with various functional groups, and can be carried out in various solvents including environmentally benign water. The reactivity of isonitriles has been compared with that of CO through competition experiments, and the results indicate that isonitriles are superior to CO as radical acceptors in reactions with stabilized radicals. The origin of the differences has been addressed in theoretical studies with density functional theory calculations using the B3LYP hybrid functional. The calculations suggest that both carbonylation and imidoylation proceed with low activation energies, and that there are virtually no differences in the kinetic sense. Instead, it indicates that thermodynamic effects, namely differences in the stability of the acyl and the imidoyl radicals, control the overall course of the reactions.
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Affiliation(s)
- S Yamago
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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68
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McDonald CE, Galka AM, Green AI, Keane JM, Kowalchick JE, Micklitsch CM, Wisnoski DD. Cyclization of unsaturated amides with triflic anhydride and samarium diiodide. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(00)01919-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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69
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Yamago S, Hashidume M, Yoshida JI. Radical-Mediated Synthesis of Substituted Quinones with Organotellurium Compounds. CHEM LETT 2000. [DOI: 10.1246/cl.2000.1234] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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70
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Miyazoe H, Yamago S, Yoshida J. Novel Group-Transfer Three-Component Coupling of Silyltellurides, Carbonyl Compounds, and Isocyanides This work was partly supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports, and Culture, Japan. We thank Professor S. Okazaki, Professor M. Oyama, and T. Morikawa of the Department of Material Chemistry of Kyoto University for the ESR measurement and valuable discussions. Angew Chem Int Ed Engl 2000; 39:3669-3671. [PMID: 11091434 DOI: 10.1002/1521-3773(20001016)39:20<3669::aid-anie3669>3.0.co;2-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- H Miyazoe
- Department of Synthetic Chemistry and Biological Chemistry Graduate School of Engineering, Kyoto University Kyoto 606-8501 (Japan)
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71
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Miyazoe H, Yamago S, Yoshida JI. Novel Group-Transfer Three-Component Coupling of Silyltellurides, Carbonyl Compounds, and Isocyanides. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3757(20001016)112:20<3815::aid-ange3815>3.0.co;2-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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72
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Yamago S, Miyazoe H, Sawazaki T, Goto R, Yoshida* JI. New synthesis of α-acyl imines by radical-mediated group-transfer imidoylation of acyl tellurides with isonitriles. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)01287-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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73
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Engman L, Laws MJ, Malmström J, Schiesser CH, Zugaro LM. Toward Novel Antioxidants: Preparation of Dihydrotellurophenes and Selenophenes by Alkyltelluride-Mediated Tandem S(RN)1/S(H)i Reactions(1). J Org Chem 1999; 64:6764-6770. [PMID: 11674684 DOI: 10.1021/jo9907235] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reaction of 1-(2-iodophenyl)-1-methyloxirane (12) with 2 equiv of sodium n-butyltellurolate (n-BuTeNa), generated by the sodium borohydride reduction of di-n-butyl ditelluride, in THF, affords 2,3-dihydro-3-hydroxy-3-methylbenzo[b]tellurophene (13) in 62% yield, together with a small quantity of 1-(n-butyltelluro)-2-phenyl-2-propanol (27). This transformation presumably involves a tandem S(RN)1/S(H)i sequence. Similar reactions of 1-(benzylseleno)-2-phenyl-2-propanol (5a, R = Me) and 1-allyloxy-2-iodobenzene (15) afforded 2,3-dihydro-3-hydroxy-3-methylbenzo[b]selenophene (17, 74%), and 3-(n-butyltelluro)methyl-2,3-dihydrobenzo[b]furan (18, 50%), respectively. Lithium alkyltellurolates, generated by direct tellurium insertion into the required alkyllithium, or sec-butyl or tert-butyl substitution on tellurium provide product distributions similar to those observed for reactions involving n-BuTeNa. Lithium or sodium phenyltellurolate returned only starting materials from these reaction mixtures. The 2-[2-(n-butyltelluro)-1-hydroxy-1-methyl]ethylphenyl radical (14) is estimated to cyclize with k(c) = 5 x 10(8) s(-)(1) at 25 degrees C. The tandem S(RN)1/S(H)i sequence has been applied to the preparation of the antioxidant analogues, 5-hydroxy-2,3-dihydrobenzo[b]tellurophene and selenophene (31, 32).
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Affiliation(s)
- Lars Engman
- Uppsala University, Institute of Chemistry, Department of Organic Chemistry, Box 531, S-751 21 Uppsala, Sweden, and School of Chemistry, The University of Melbourne, Parkville, Victoria, Australia, 3052
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74
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75
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Li A, Shtarev AB, Smart BE, Yang ZY, Lusztyk J, Ingold KU, Bravo A, Dolbier WR. Cyclizations of 5-Hexenyl, 6-Heptenyl, 7-Octenyl, and 8-Nonenyl Radicals. The Kinetic and Regiochemical Impact of Fluorine and Oxygen Substituents. J Org Chem 1999. [DOI: 10.1021/jo990544n] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anrong Li
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, DuPont Central Research & Development, Experimental Station, Wilmington, Delaware 19880-0328, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Alexander B. Shtarev
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, DuPont Central Research & Development, Experimental Station, Wilmington, Delaware 19880-0328, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Bruce E. Smart
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, DuPont Central Research & Development, Experimental Station, Wilmington, Delaware 19880-0328, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Zhen-Yu Yang
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, DuPont Central Research & Development, Experimental Station, Wilmington, Delaware 19880-0328, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Janusz Lusztyk
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, DuPont Central Research & Development, Experimental Station, Wilmington, Delaware 19880-0328, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Keith U. Ingold
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, DuPont Central Research & Development, Experimental Station, Wilmington, Delaware 19880-0328, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Anna Bravo
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, DuPont Central Research & Development, Experimental Station, Wilmington, Delaware 19880-0328, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - William R. Dolbier
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, DuPont Central Research & Development, Experimental Station, Wilmington, Delaware 19880-0328, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
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Dakternieks D, Henry DJ, Schiesser CH. Steric trends and kinetic parameters for radical reductions involving alkyldiphenyltin hydrides. J PHYS ORG CHEM 1999. [DOI: 10.1002/(sici)1099-1395(199903)12:3<233::aid-poc117>3.0.co;2-t] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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78
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Radical-mediated imidoylation of telluroglycosides. Insertion of isonitriles into the glycosidic carbontellurium bond. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00183-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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79
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Reversible generation of glycosyl radicals from telluroglycosides under photochemical and thermal conditions. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00181-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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80
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Rigby JH, Danca DM, Horner JH. Carbamoyl radicals from Se-phenylselenocarbamates: Intramolecular additions to alkenes. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(98)01830-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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81
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Lee E, Yoon CH, Lee TH, Kim SY, Ha TJ, Sung YS, Park SH, Lee S. 8-Endo Cyclization of (Alkoxycarbonyl)methyl Radicals: Radical Ways for Preparation of Eight-Membered-Ring Lactones. J Am Chem Soc 1998. [DOI: 10.1021/ja980908d] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eun Lee
- Contribution from the Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea
| | - Cheol Hwan Yoon
- Contribution from the Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea
| | - Tae Hee Lee
- Contribution from the Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea
| | - Sun Young Kim
- Contribution from the Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea
| | - Tae Joon Ha
- Contribution from the Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea
| | - Yong-suk Sung
- Contribution from the Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea
| | - Sang-Hyun Park
- Contribution from the Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea
| | - Sangyoub Lee
- Contribution from the Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea
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82
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Schiesser CH, Skidmore MA. Palladium-Mediated Reactions of Chloroformates with Phenylselenotris(trimethylsilyl)silane and Aryltellurotris(trimethylsilyl)silane: Improved Procedure for the Preparation of (Phenylseleno)- and (Aryltelluro)formates. J Org Chem 1998. [DOI: 10.1021/jo980710b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Carl H. Schiesser
- School of Chemistry, The University of Melbourne, Parkville, Victoria, Australia 3052
| | - Melissa A. Skidmore
- School of Chemistry, The University of Melbourne, Parkville, Victoria, Australia 3052
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83
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Zhao CQ, Li JL, Meng JB, Wang YM. Telluroacylative Addition of Telluroesters to Terminal Alkynes Catalyzed by Cuprous Iodide. J Org Chem 1998. [DOI: 10.1021/jo980682x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chang-Qiu Zhao
- Department of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Jin-Liang Li
- Department of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Ji-Ben Meng
- Department of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Yong-Mei Wang
- Department of Chemistry, Nankai University, Tianjin, 300071, P. R. China
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84
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Dakternieks D, Henry DJ, Schiesser CH. Equilibria in Free-Radical Chemistry: An Ab Initio Study of Hydrogen Atom Transfer Reactions between Silyl, Germyl, and Stannyl Radicals and Their Hydrides. Organometallics 1998. [DOI: 10.1021/om9709906] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dainis Dakternieks
- School of Biological and Chemical Sciences, Deakin University, Geelong, Victoria, Australia 3217, and School of Chemistry, The University of Melbourne, Parkville, Victoria, Australia 3052
| | - David J. Henry
- School of Biological and Chemical Sciences, Deakin University, Geelong, Victoria, Australia 3217, and School of Chemistry, The University of Melbourne, Parkville, Victoria, Australia 3052
| | - Carl H. Schiesser
- School of Biological and Chemical Sciences, Deakin University, Geelong, Victoria, Australia 3217, and School of Chemistry, The University of Melbourne, Parkville, Victoria, Australia 3052
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85
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Studer A. SHi-Reaktionen an Siliciumzentren als unimolekulare Kettentransferschritte bei der Bildung cyclischer Silylether. Angew Chem Int Ed Engl 1998. [DOI: 10.1002/(sici)1521-3757(19980216)110:4<507::aid-ange507>3.0.co;2-j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Schiesser CH, Wild LM. Intramolecular Homolytic Translocation Chemistry: An ab Initio Study of 1,n-Halogen Atom Transfer Reactions in Some omega-Haloalkyl Radicals. J Org Chem 1998; 63:670-676. [PMID: 11672059 DOI: 10.1021/jo9716385] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ab initio calculations using all-electron (3-21G(()()), 6-311G) and pseudopotential (DZP) basis sets, with (MP2, QCISD) and without (UHF) the inclusion of electron correlation, predict that 1,n-halogen transfer reactions in the 5-halo-1-pentyl (6), 6-halo-1-hexyl (7), and 7-halo-1-heptyl radicals (8) proceed via C(s)- and/or C(2)-symmetric transition states (9-11), except for the 5-bromo-1-pentyl (6, X = Br) radical for which a C(s)-symmetric transition state (9) was located only at the UHF/3-21G(()()) level of theory and the 5-iodo-1-pentyl radical (6, X = I) for which no transition state (9) could be located at any level of theory used in this study. Energy barriers for these translocation reactions of between 120.0 (1,7-iodine transfer) and 191.0 kJ mol(-)(1) (1,5-chlorine transfer) are predicted at the MP2/DZP level of theory; QCISD/DZP (single-point) calculations predict similar energy barriers. These high energy barriers are a consequence of unfavorable factors associated with ring size and long carbon-halogen separations in transition states (9-11) which lead to significant deviations from the collinear arrangement of attacking and leaving radicals preferred in transition states involved in homolytic substitution reactions at halogen. The dependence of transition state energy on attack angle at halogen has been explored for the attack of methyl radical at chloromethane. At the MP2/DZP level of theory, attack angles of between 80 and 90 degrees are calculated to lead to increases in energy barrier of about 100 kJ mol(-)(1) when compared with the collinear (180 degrees ) arrangement of attacking and leaving groups. The mechanistic implications of these predictions are discussed.
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Affiliation(s)
- Carl H. Schiesser
- School of Chemistry, The University of Melbourne, Parkville, Victoria, Australia 3052
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87
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Beckwith ALJ, Crich D, Duggan PJ, Yao Q. Chemistry of beta-(Acyloxy)alkyl and beta-(Phosphatoxy)alkyl Radicals and Related Species: Radical and Radical Ionic Migrations and Fragmentations of Carbonminus signOxygen Bonds. Chem Rev 1997; 97:3273-3312. [PMID: 11851491 DOI: 10.1021/cr950207o] [Citation(s) in RCA: 104] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Athelstan L. J. Beckwith
- Research School of Chemistry, The Australian National University, Canberra, ACT 0200, Australia, Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061, and Department of Chemistry, Monash University, Clayton, Victoria 3168, Australia
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88
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Laws MJ, Schiesser CH. Intramolecular homolytic substitution at tellurium: Preparation of a dihydrotellurophene by alkyltelluride-mediated SRN1/SHi reactions. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)10239-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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89
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He W, Togo H, Yokoyama M. Strategic approach to C-nucleosidesvia sugar anomeric radical, cation, and anion with sugar tellurides. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01196-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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90
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91
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92
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Bertrand MP, Crich D, Nouguier R, Samy R, Stien D. Diastereoselective Cyclizations of 1,3-Dioxan-2-yl Radicals: Chiral Acyl Radical Equivalents. J Org Chem 1996; 61:3588-3589. [PMID: 11667201 DOI: 10.1021/jo960705c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michèle P. Bertrand
- LCMO, URA 1412, Université d'Aix-Marseille III, Faculté des Sciences de Saint-Jérôme, 13397 Marseille Cédex 13, France, and Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061
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93
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94
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Crich D, Yao Q. Generation of Acyl Radicals from Thiolesters by Intramolecular Homolytic Substitution at Sulfur. J Org Chem 1996. [DOI: 10.1021/jo960115e] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David Crich
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061
| | - Qingwei Yao
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061
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95
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Kim S, Jon SY. Radical cyclization of thio- and seleno-esters–an intramolecular acylation approach. Chem Commun (Camb) 1996. [DOI: 10.1039/cc9960001335] [Citation(s) in RCA: 30] [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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96
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Hayes CJ, Pattenden G. α-ketene alkyl and α,β-unsaturated acyl radical intermediates in ring constructions. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(95)02147-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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97
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Kawahara Y, Kato S, Kanda T, Murai T, Ebihara M. Synthesis of Rubidium and Cesium Tellurocarboxylates and an X-Ray Structural Analysis of Heavy Alkali Metal Monochalcogenocarboxylates. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1995. [DOI: 10.1246/bcsj.68.3507] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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98
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Dabdoub MJ, Begnini ML, Cassol TM, Guerrero PG, Silveira CC. Synthesis of (e)-vinylic tellurides and their transformation into α,β-unsaturated esters and carboxylic acids. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)01585-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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99
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Schiesser CH, Smart BA. An ab initio study of some free-radical homolytic substitution reactions at sulfur, selenium and tellurium. Tetrahedron 1995. [DOI: 10.1016/0040-4020(95)00263-8] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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