Polycarbonate resin composition stabilized against radiation
申请人:MITSUBISHI ENGINEERING-PLASTICS CORPORATION
公开号:EP0794218A2
公开(公告)日:1997-09-10
The present invention relates to a polycarbonate resin composition comprising 100 parts by weight of a polycarbonate resin; 0.01 to 5 parts by weight of a compound containing oxymethylene unit, a compound containing oxymethylene unit having substituent or a cyclic ether compound having substituent.
Schoenberg; Iskander, Journal of the Chemical Society, 1942, p. 90,92
作者:Schoenberg、Iskander
DOI:——
日期:——
1,4-Silatropy of <i>S</i>-α-Silylbenzyl Thioesters: A Convenient Route to Silyl Enol and Dienol Ethers Accompanied by C−C Bond Formation via Thiocarbonyl Ylides
A novel convenient method for the generation of thiocarbonyl ylides from readily accessible starting materials and the first synthetic application of in situ generated ylides in the synthesis of silyl enol and dienol ethers, accompanied by C-C bond formation, is described. Under completely neutral conditions without any catalyst or additive, thermal reactions of S-alpha-silylbenzyl thioesters in sealed tubes at 180 degreesC provided silyl enol and dienol ethers in good to excellent yields with high stereoselectivities. This procedure consists of a multistep reaction in a one-pot process, i.e., 1,4-silatropy of S-alpha-silylbenzyl thioesters to give thiocarbonyl ylides, 1,3-electrocyclization of the ylides to give thiiranes, and the extrusion of sulfur from thiiranes to give silyl enol and dienol ethers.
REITZ D. B.; BEAK P.; FARNEY R. F.; HELMICK L. S., J. AMER. CHEM. SOC., 1978, 100, NO 17, 5428-5436
作者:REITZ D. B.、 BEAK P.、 FARNEY R. F.、 HELMICK L. S.