Co-catalysis of a bi-functional ligand containing phosphine and Lewis acidic phosphonium for hydroformylation–acetalization of olefins
作者:Yong-Qi Li、Peng Wang、Huan Liu、Yong Lu、Xiao-Li Zhao、Ye Liu
DOI:10.1039/c5gc02127h
日期:——
L2 containing a phosphine and a Lewis acidic phosphonium exhibited synergetic catalysis and sequential catalysis for one-pot hydroformylation–acetalization.
L2 包含一种膦和一种路易斯酸性磷酸铵,展示了协同催化和顺序催化,用于一锅法羰基化-缩醛化。
Oxolanyl cyclic acetals as anionic polymerization modifiers
申请人:Bridgestone Corporation
公开号:US05112929A1
公开(公告)日:1992-05-12
A method for preparing a diene polymer or copolymer having increased amounts of 1,2-microstructure is provided. The method involves polymerizing a diene monomer or mixture of a diene monomer and a vinyl aromatic hydrocarbon monomer in a hydrocarbon solvent in the presence of a catalytically effective amount of a catalyst composition comprising: (a) an organolithium initiator and (b) an oxolanyl cyclic acetal having the structural formula: ##STR1## wherein R is selected from the group consisting of hydrogen and alkyl groups containing from 1 to 4 carbon atoms and X is 0 or 1.
DIENE RUBBER, PROCESS FOR PRODUCING THE RUBBER AND RUBBER COMPOSITION CONTAINING THE SAME
申请人:NIPPON ZEON CO., LTD.
公开号:EP0882738A1
公开(公告)日:1998-12-09
A diene rubber comprised of a conjugated diene homopolymer or a conjugated diene/aromatic vinyl copolymer; the homopolymer or copolymer having at least one end of its polymer chain a quaternary ammonium group to which four carbon atoms have been bound, and containing 0 to 60% of aromatic vinyl units; at least 10% of the bound conjugated diene units being a vinyl bond; and the homopolymer or copolymer further having a weight average molecular weight (Mw) of 100,000 to 2,000,000. This rubber exhibits well reduced heat build-up, which is an index of a well reduced rolling resistance, and having tensile strength and abrasion resistance.