[reaction: see text] The first example of a kineticresolution process promoted by electrophilic selenium reagents is reported. Racemic allylic alcohols react with half equivalents of a selenenylating agent in methanol leading to the regiospecific formation of the corresponding addition products with a very high level of facial selectivity (from 95:5 to 98:2 dr). The unreacted alcohols can be recovered
In the presence of a catalytic amount of trityl perchlorate, secondary and tertiary allyl ethers smoothly react with allylsilanes and silyl cyanide to give the corresponding 1,5-dienes and β,γ-unsaturated nitriles, respectively, in good yields.