4-Methyl-/rans-2-pentene

Most of the experiments with 1-hexene were run to assess the effect of conditions of activation upon the rate of hydrogenation. We ran some experiments with Chemical Samples Company, Columbus, Ohio. The 4-methyl-1-pentene could be used directly but poisons in the /raws-2-hexene required it to be percolated through alumina directly into the saturator. 

The symmetrical 3-isopropenyl-4-methyl-4-penten-l-al with neutral [RhCl-(R)-BINAP] gives 3-isopropenyl-4-methylcyclopentanone preferentially as the d.v-isomer with > 99% ee, while the cationic complex leads to the /rans-isomer with > 99% ee52. 

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