Mass spectral rearrangements of 3-arylsulphonyl-2-arylthiopropenes andN-(4′-arylsulphonyl-2′-butynyl)-N-(4″-arylthio-2″-butynyl)anilines
摘要:
AbstractUnder electron impact the title compounds undergo skeletal rearrangement in addition to the anticipated modes of cleavage. The 3‐arylsulphonyl‐2‐arylthiopropenes readily eliminate sulphur dioxide. Other modes of fragmentation include rearrangement to a bisaryl sulphide moiety and sulphone‐sulphinate rearrangement. The formation of a bisaryl sulphide ion is analogous to the behaviour of the isomeric trans‐1‐arylsulphonyl‐2‐arylthiopropenes. N‐(4′‐Arylsulphonyl‐2′‐butynyl)‐N‐(4″‐arylthio‐2″‐butynyl) anilines do not undergo any of the skeletal rearrangements mentioned above, but display the concerted loss of the arylsulphonyl and arylthio moieties. Similar eliminations have been observed from the analogous bis‐sulphides and bis‐sulphones.
Aspects of the chemistry of 4-tributylstannyl-, 4-trimethylsilyl- and 2-phenylsulfinylallylstannanes
作者:Simon V Mortlock、Eric J Thomas
DOI:10.1016/s0040-4020(98)00183-5
日期:1998.4
stannanes 3 and 4 have been prepared by treatment of the allylic sulfones 6 and 7 with tributyltin hydride under free-radical conditions and shown to react under non-catalysed and Lewis acid promoted conditions with 4-nitrobenzaldehyde to give the anti- and syn-products 9/11 and 8/10, respectively, with reasonable levels of stereoselectivity. The 2-arylsulfinylpropenylstannanes 17 and 18 were also