Oligomers and homopolymers of meta- or para-isopropenyl-alpha,alpha-dimethylbenzylisocyanate
申请人:AMERICAN CYANAMID COMPANY
公开号:EP0130313A2
公开(公告)日:1985-01-09
Aromatic solvent-soluble linear oligomers or homopolymers of meta- or para-isopropenyl-a,a-dimethylbenzyl- isocyanate characterized by high isocyanate content are disclosed. Such oligomers or homopolymers are made by catalytic solution polymerization of the monomer in methylene chloride and/or toluene solution at a temperature of from about -80°C to about -25°C, followed by low- temperature neutralization of the polymerization catalyst.
Preparation and decarboxylative rearrangement of (Z)-enyne esters
作者:Jacqueline C.S. Woo、Shawn D. Walker、Margaret M. Faul
DOI:10.1016/j.tetlet.2007.06.012
日期:2007.8
A method to assemble (Z)-enyne esters via palladium-catalyzed cross coupling reactions of enol tosylates is reported. A base-mediated one-pot decarboxylative rearrangement of the enynes to enones is described. The scope of this process is examined. (c) 2007 Elsevier Ltd. All rights reserved.
Synthesis of β,γ-Unsaturated Ketones via Cerium-Mediated Addition of Organolithiums to Silylated Enaminones
作者:Renato Dalpozzo、Antonio De Nino、Giuseppe Bartoli、Marcella Bosco、Letizia Sambri、Enrico Marcantoni
DOI:10.1021/jo971520o
日期:1998.5.1
[EN] REMOVAL OF METAL CONTAMINANTS FROM POLYETHYLENE<br/>[FR] ÉLIMINATION DE CONTAMINANTS MÉTALLIQUES DU POLYÉTHYLÈNE
申请人:EQUISTAR CHEM LP
公开号:WO2009078902A1
公开(公告)日:2009-06-25
A process to remove metal contaminants from a hydrocarbon solution of polyethylene is disclosed. The process comprises adding a primary alcohol and a ß-diketone to a solution of polyethylene at a temperature within the range of 120°C to 300°C and contacting the solution with basic alumina. The process removes metal contaminants and minimizes degradation and condensation products, which can have a detrimental effect on polyethylene properties. The process provides polyethylene with low metal residues and good properties.