ISOPROPENYLATION OF OLEFINS VIA THE REACTION OF IODINE WITH LITHIUM TRIALKYLISOPROPENYLBORATES OBTAINABLE FROM TRIALKYLBORANES

Lithium trialkylisopropenylborates readily available from trialkylboranes and isopropenyllithium give the corresponding isopropenylalkanes in good yields by treatment with iodine. This procedure was applied to synthesize monoterpene derivatives such as limonene, diprene and an isomeric dihydrolinalool.