Ortho metalation of N-substituted benzenesulfonamides by excess N-butyllithium. Condensation with carbonyl compounds. Cyclizations
作者:Hamao Watanabe、Robert L. Gay、Charles R. Hauser
DOI:10.1021/jo01266a111
日期:1968.2
Short-Chain Branched Polar-Functionalized Linear Polyethylene via “Tandem Catalysis”
作者:Zhongbao Jian、Stefan Mecking
DOI:10.1021/acs.macromol.6b00581
日期:2016.6.14
per 1000 C were generated from the polymerization of ethylene alone in a “tandem catalysis” one-pot approach. In further exploitation of this concept, linear polyethylenes with both various short-chainbranches and a choice of different polar functional groups incorporated into the main chain were obtained for the first time from the copolymerization of ethylene and polar vinyl monomers (methyl acrylate
已经合成了N-固定的磷化氢磺胺盐螯合的阳离子Pd II配合物1,并对其结构进行了表征。将1暴露于乙烯导致形成具有10 5 mol E mol的高催化活性的短链烯烃(1-丁烯:2-丁烯:1-己烯:1-辛烯= 86:7:6:1)钯–1小时–1。通过组合1和公知的钯phosphinesulfonato之一II催化剂前体2 - 5,含有甲基,乙基,和线性聚乙烯Ñ在“串联催化”一锅法中,仅通过乙烯的聚合反应就可产生高达每1000 C 100的丁基支链。在此概念的进一步开发,首次由乙烯和极性乙烯基单体的共聚(甲基丙烯酸酯,获得具有两个不同的短支链和结合到主链上的不同的极性官能团的选择线性聚乙烯ñ -异丙基丙烯酰胺,甲基乙烯基砜,丙烯腈,乙基乙烯基醚,乙酸乙烯酯和烯丙基溴)。所有这些非极性和极性分支以不同程度并入线性聚乙烯主链中,而所得聚乙烯的起始和终止链端的类型很大程度上取决于极性乙烯基单体的性质。