The reaction of singletoxygen with 2-methyl-3-phenylsulfinyl-2-butene (1a) and E2-phenylsulfinyl-2-butene (1b) gives the corresponding allyl alcohols (2a and 2b) after reduction with dimethyl sulfide. α,β-Unsaturated sulfoxides with s-trans conformation failed to proceed the ene-type oxidation but afforded S-oxidation products. On the other hand, 4-methyl-1,2,4-triazoline-3,5-dione (MeTAD) reacted
The enereaction of N-Phenyl-1,2,4-triazoline-3,5-dione with alkenes shows a remarkable preference for hydrogen abstraction from the group which is geminal to the larger substituent of the double bond. These results require that the dominant effect in the transition state of the enereaction is the nonbonded interactions.
作者:Ottorino De Lucchi、Gaetano Marchioro、Giorgio Modena
DOI:10.1039/c39840000513
日期:——
Acid catalysed isopropenyl acetate treatment of vinyl sulphoxides results in a formal oxygen transposition from sulphur to the β-olefinic carbon via a presumed [3,3]-sigmatropic rearrangement of an acetoxysulphonium salt.