Selective formation of substituted cyclopentane derivatives from hexa-1,5-dienes via oxidative cyclization in the presence of Pd(OAc)<sub>2</sub>–MnO<sub>2</sub>–benzoquinone as catalyst
Hexa-1,5-dienes undergo oxidative ring closure catalysed by palladium acetate using p-benzoquinone–manganese dioxide as oxidant to give acetoxy-substituted methylene-cyclopentane derivatives.
Titanocene hydride derivatives induce the cyclization of 1,2-divinylcyclohexanes to trans- and cis-1-methylene-octahydro-1H-indene and their isomerization to trans- and cis-3-methyl-3a,4,5,6,7,7a-hexahydro-1H-indene.
Palladium-catalyzed oxidative cyclization of 1,5-dienes. Influence of different substitution patterns on the regio- and stereochemistry of the reaction