Nickel complex-catalysed reaction of propylmagnesium bromide with butadiene. A highly stereoselective synthesis of cis- and trans-(2-vinylcyclopentyl)methylmagnesium bromide
Abstract
Propylmagnesium bromide, butadiene, and catalytic amounts of [(PPh3)2NiCl2] afford octa-2,7-dienyl-magnesium bromide; this cyclises to cis-(2-vinylcyclo-pentyl)methylmagnesium bromide, which can be thermally epimerised to the trans isomer.