Synthesis of Unsaturated Silyl Heterocycles via an Intramolecular Silyl-Heck Reaction
作者:William B. Reid、Jesse R. McAtee、Donald A. Watson
DOI:10.1021/acs.organomet.9b00498
日期:2019.10.14
We report the synthesis of unsaturated silacycles via an intramolecular silyl-Heck reaction. Using palladium catalysis, silicon electrophiles tethered to alkenes cyclize to form 5- and 6-membered silicon heterocycles. The effects of alkene substitution and tether length on the efficiency and regioselectivity of the cyclizations are described. Finally, through the use of an intramolecular tether, the
derivative and a compound apparently formed by 1,4-silylene addition, along with a 1/1 “ene” adduct of the diene to a photo-rearranged intermediate containing the silicon—carbon double bond. Irradiation of I in the presence of the conjugateddiene with a low-pressure mercury lamp, followed by treatment of the product with methanol, afforded a methoxysilane arising from methanolysis of the corresponding silacyclopropane
Ene-reactions en series organosiliciee et germaniee
作者:Andre Laporterie、Jacques Dubac、Michel Lesbre
DOI:10.1016/s0022-328x(00)86403-7
日期:1975.11
Enereactions involving enes and enophiles of silicon and germanium have been investigated. Organometallic δ-ethylenic compounds were synthesized and an allylic group converted into a vinylic one , to obtain 1-sila- or 1-germacyclopent-2-enes.
Photochemical generation of dimethylsilylene, methyl(phenyl)silylene and diphenylsilylene in the presence of high concentrations of 1,3-butadiene leads to the formation of 1-sila-3,4-divinylcyclopentanes as major products in addition to the anticipated 1-silacyclopent-3-enes. Also obtained are the ene-reaction products from the silenes, formed by formal 1,3-silyl shifts in the bis(trimethylsilyl)arylsilanes
Crosslinkable saturated and unsaturated carbosilane polymers and
申请人:University of Southern California
公开号:US05171792A1
公开(公告)日:1992-12-15
Crosslinkable saturated and unsaturated carbosilane polymers are prepared by polymerizing vinyl substituted 1-silacyclo-pent-3-ene or vinyl substituted 1-silacyclobutane monomers in the presence of an anionic ring opening catalyst.