The addition of Cl2, Br2 or lCl to 2-endo-3-exo-bis(phenylsulfonyl)norborn-5-ene 1 in the presence of AgBF4, or the methylation of the epoxide of 1 allow the observation or isolation of the isomeric γ-sultinium ions 2 and 3(X = Cl, Br, I, OMe); the addition of Me3S3+SbCl6â leads to thiiranium ion 4(X = SMe); in the case of X = 1, 2 and 3 interconvert via the intermediacy of 4.
作者:COSSU, SERGIO、DE, LUCCHI OTTORINO、DILILLO, FRANCESCO
DOI:——
日期:——
Intramolecular nucleophilic interception by the sulfonyl group of reaction intermediates arising from electrophilic addition to unsaturated non-conjugated bicyclic sulfones
作者:J. I. G. Cadogan、Donald K. Cameron、Ian Gosney、John R. A. Millar、Stephen F. Newlands、David Reed
DOI:10.1039/p29960002309
日期:——
Electrophilic addition of molecular bromine and related reactions to unsaturated bicyclic sulfones resulting in atypical addition is described. Bromination of the bicyclic sulfone 3 results in a ca. 1 : 1 mixture of exo,exo- and exo,endo-dibromides 4 and 5, respectively. Similarly, acid-catalysed cleavage of epoxide 8 produces a 37 : 63 mixture of exo,exo- and exo,endo-bromohydrins 9 and 10, respectively