The present invention provides unimolecular metal complexes having increased activity in the copolymerization of carbon dioxide and epoxides. Also provided are methods of using such metal complexes in the synthesis of polymers. According to one aspect, the present invention provides metal complexes comprising an activating species with co-catalytic activity tethered to a multidentate ligand that is coordinated to the active metal center of the complex.
GRAPHICAL ABSTRACT Abstract A method for the preparation of three-membered phosphoric heterocycles—phosphi-ranes by reaction of dilithium derivatives of tertiary phosphines with tetrachloromethane is described. The reaction is stereoselective and leads to the formation of anti-cis(meso)-2,3-diphenylphosphiranes. Phosphiranes were isolated as individual compounds and their structure was confirmed by
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0004409A2
公开(公告)日:1979-10-03
1,7-Octadiene can be prepared by hydrodimerizing butadiene in the presence of a catalytic amount of palladium, a tertiary phosphine, formic acid, a base and optionally a solvent. High selectivities to 1,7-octadiene are obtained if the phosphine has the formula: R1R2R3P wherein Ri is a benzyl group or an optionally unsaturated branched alkyl group having from 3 to 10 carbon atoms with branching occurring at a carbon atom no more than two carbon atoms from the phosphorus atom and R2 and R3 are R1 or independently optionally unsaturated alkyl or aryl groups having from 1 to 10 carbon atoms.
Kolodyazhnyi, O. I.; Ustenko, S. N., Journal of general chemistry of the USSR, 1992, vol. 62, # 6.2, p. 1165 - 1166
作者:Kolodyazhnyi, O. I.、Ustenko, S. N.
DOI:——
日期:——
SALEN COMPLEXES WITH DIANIONIC COUNTERIONS
申请人:Novomer, Inc
公开号:US20140336354A1
公开(公告)日:2014-11-13
The present invention describes metal salen complexes having dianionic counterions. Such complexes can be readily precipitated and provide an economical method for the purification and isolation of the complexes, and are useful to prepare novel polymer compositions.