Chlorochalcogenation of acetylenes with benzenesulfen-(or selenen)amides and Tin(IV) chloride
作者:A. V. Martynov、N. A. Makhaeva、S. V. Amosova
DOI:10.1134/s1070428006070037
日期:2006.7
Benzenesulfenainides and benzeneselenenamides reacted with terminal and internal acetylenes (hex-1-yne, phenylacetylene, hex-3-yne, but-2-yne-1,4-diol, and diphenylacetylene) in the presence of SnCl4 to give the corresponding chloroethenyl sulfides and selenides. From symmetric acetylenes, only E isomers (E)-ArXCR=CClR (X = S, Ar = Ph, 4-CIC6H4; R = Et, Ph, HOCH2; X = Se, Ar = Ph, R = Et) were formed. The reactions of benzenesulfenamide with terminal acetylenes, apart from the corresponding Markownikoff and anti-Markownikoff adducts (PhSCH=CCIR and PhSCR=CHCI, R = Bu, Ph) gave ethynyl sulfides PhSC=-CR (R = Ph, Bu) and cis/trans-isomeric 1,2-bis(phenylsulfayl)chloroethenes PhSCR=CClSPh (R = Ph, Bu). The results were interpreted assuming intermediate generation of sulfenyl and selenenyl chlorides via reaction of sulfen- and selenenamides with SnCl4.