Site-Selective Hydrosilylation of Botryococcene - The Algal Biomass Hydrocarbon Oil

摘要

abstract_textpAn algal acyclic triterpene botryococcene ((E)-2,3,7,10,13,16,20,21-octamethyl-6,17-dimethylene-10-vinyldocosa-1,11,21-triene), new biomass for material sources, which has three-types of six carbon-carbon double bonds, i.e., four vinylidenes at C2,6,17,21-positions, one C10-vinyl, and one C11-12 internal olefin, in the molecule underwent hydrosilylation of various organosilanes in the presence of Pt(0) 1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex (Karstedt's catalyst). Various hydrosilylated botryococcene derivatives were site- and regioselectively obtained in high yields by an anti-Markovnikov type addition at the C10-vinyl moiety without any isomerizations of the unsaturated triterpenoid skeleton./p/abstract_text