Changing stereoselectivity and regioselectivity in copper(<scp>i</scp>)-catalyzed 5-<i>exo</i> cyclization by chelation and rigidity in aminoalkyl radicals: synthesis towards diverse bioactive N-heterocycles
作者:Sandhya Sadanandan、Dharmendra Kumar Gupta
DOI:10.1039/c9nj05166j
日期:——
Chelation, rigidity and carbon-radical positions in aminoalkyl precursors disturb the usual 2,4-trans diastereoselectivity and 5-exo mode in Cu(i)-catalyzed ATRC.
Supported catalyst containing active titanium in the homo, co-, and ter-polymerization of olefin-unsaturated compounds
申请人:Masi Francesco
公开号:US20060014631A1
公开(公告)日:2006-01-19
The present invention relates to a supported catalyst containing titanium, its preparation and it use in the homo-, co-, and ter-polymerization of olefin-unsaturated compounds. The present invention also relates to a catalytic system comprising a supported catalyst based on titanium and a co-catalyst selected from organo-derivatives of aluminum. More, specifically, the present invention relates to catalyst supported on silica, obtained by reacting a titanium halocarboxylate and a magnesium halocarboxylate with an aluminum chloroakylderivative, in the presente of a carrier consisting of high porosity silica. The above reaction essentially takes place in the pores of the silica itself.
Titanium catalysts, preparation and use in co- and ter-polymerization of alpha-olefins
申请人:——
公开号:US20040143127A1
公开(公告)日:2004-07-22
Titanium complex having general formula (1) (RCOO)
n
TiX
p
wherein R is a monofunctional hydrocarbyl radical having from 1 to 20 carbon atoms and a number of halogen atoms, selected from fluorine, chlorine and bromine, preferably chlorine, ranging from 1 to 6; X is chlorine, bromine or a beta-dicarbonyl group such as acetylacetone (AcAc), formylacetone, benzoylacetone, dibenzoylmethane; p+n=2, 3, 4, preferably p+n=3; n is greater than or equal to 1. The preparation of the above complex and its use in the co- and ter-polymerization of &agr;-olefins, are also described.
PROCESS FOR MAKING AN ETHYLENE ELASTOMER WITH LONG CHAIN BRANCHING FOR USE IN ANTI-VIBRATION APPLICATIONS
申请人:Lion Copolymer Geismar, LLC
公开号:EP3026070A1
公开(公告)日:2016-06-01
A process and the resultant product from the process for continuously making a blend of a terpolymer and a tetrapolymer utilizing ethylene, propylene, and non-conjugated dienes. This process allows for the creation of products with high diene contents and broad molecular weight distributions while utilizing a continuous flow reactor and a known catalyst. The process allows for these products to be made without gelling or fouling of the reactor, which are problems known in the art.