Economical, Green, and Safe Route Towards Substituted Lactones by Anodic Generation of Oxycarbonyl Radicals
作者:Alessia Petti、Matthew C. Leech、Anthony D. Garcia、Iain C. A. Goodall、Adrian P. Dobbs、Kevin Lam
DOI:10.1002/anie.201909922
日期:2019.11.4
A new electrochemical methodology has been developed for the generation of oxycarbonyl radicals under mild and green conditions from readily available hemioxalate salts. Mono- and multi-functionalised γ-butyrolactones were synthesised through exo-cyclisation of these oxycarbonyl radicals with an alkene, followed by the sp3 -sp3 capture of the newly formed carbon-centred radical. The synthesis of functionalised
Components and catalysts for the polymerization of olefins
申请人:Gulevich Yuri
公开号:US20090118446A1
公开(公告)日:2009-05-07
The present invention relates to a solid catalyst component for the polymerization of olefins CH
2
═CHR in which R is hydrogen or a hydrocarbon radical with 1-12 carbon atoms, comprising Mg, Ti, halogen and an electron donor selected from γ-butyrolactone derivatives of a particular formula. Said catalyst components, when used in the polymerization of olefins and in particular of propylene, are capable to give polymers in high yields and with high isotactic index expressed in terms of high xylene insolubility.