Stibonium ylides reactions

The first stibonium ylide to be isolated was triphenylstibonium tetraphenylcyclopen-tadienylide, obtained by thermal decomposition of diazotetraphenylcyclopentadiene in the presence of triphenylstibine. A problem which arose initially in the preparation of stibonium ylides from thermal decomposition reactions of diazo compounds was that the... [Pg.682]

Stibonium ylides bearing two electron-withdrawing substituents did not undergo Wittig reactions ... [Pg.684]

It has also proved possible to make alkenes in a one-pot process from diazo compounds N2CR2, where R is an electron-withdrawing group, and aldehydes or ketones by heating them in the presence of tributylstibine no base was required Reaction was assumed to proceed through a stibonium ylide as intermediate, although it proved impossible to isolate this ylide, which probably reacted further too rapidly to allow this. [Pg.685]

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