Allene Vinyl Halide

In organic chemistry a vinyl halide is a compound with the formula ch 2 chx x halide.

Allene vinyl halide.

However the experimental procedure can be modified so that this synthesis can be carried out using a wide range of alkyl aryl vinyl benzyl and allyl halides. Silver nitrate does not precipitate silver halides in the presence of vinyl halides and this fact was historically used to dispute the existence of the vinyl cation species. The reaction of allene with a lower order silylcuprate 3 leads to an allylsilane vinylcopper intermediate 4 which undergoes palladium catalyzed cross coupling reaction with both vinyl and aryl halides. A detailed discussion of these modifications is beyond the scope of this course but you.

An allyl group is a substituent with the structural formula h 2 c ch ch 2 r where r is the rest of the molecule. In order to obtain a good yield of alkane both r x and rx should be primary alkyl halides. Consistent with s n 1 chemistry these reactions follow first order kinetics. For this reason alkenyl halides with the formula rch chx are sometimes called vinyl halides.

The telomerization of allene with allyl and diallylamines yields secondary and tertiary alkadienylamines with up to 85 selectivity. Aryl or vinylpalladium halide addition to an allene also produces an η 3 allylpalladium halide suitable for amination. The term vinyl is often used to describe any alkenyl group. The name is derived from the latin word for garlic allium sativum.