general approach for the one-pot hydroaminomethylation of olefinsusing methylformate as formylating agent instead of synthesis gas (syngas) has been proposed. Herein we report that a Ru–Rh catalytic system demonstrates high activity in a tandem conversion of a series of n-alkenes into aminesusing methylformate with yields 58–92% (6 h). The selectivity for the normal amine reached 96% with catalysis by
Polystyrene polymers of structure :
in which, R' and R2 are the same or different and are each C1-4 alkyl; R3 is (CH2)nR4 in which R4 is C3-6 cycloalkyl or a bicyclic carbocyclic ring of up to 10 carbon atoms and n is 1 to 12, or R3 is (CH2)nCH = RSR6 in which n is 1 to 12 and R5 and R6 together form a C3-6 cycloalkyl ring or a bicyclic carbocyclic ring of up to 10 carbon atoms; R7 is hydrogen or a group CH2NR1R2R3X-; X- is a counter ion; a, b and c are numbers which indicate the relative molar percentages of the units present in said polymer, (b) being from about 1 to about 10 molar percent, and (c) being from about 30 to about 98 molar percent; m is a number indicating the degree of polymerisation of said polymer, processes for their preparation, compositions containing them and their use in therapy as bile acid sequestering agents.
COUMPOUNDS AND METHODS FOR INHIBITING THE INTERACTION OF BCL PROTEINS WITH BINDING PARTNERS
申请人:Infinity Discovery, Inc.
公开号:EP1768966B1
公开(公告)日:2012-03-07
PROCESS OF MAKING MODIFIED METALLOCENE CATALYST, CATALYST PRODUCED AND USE THEREOF
申请人:W. R. Grace & Co.-Conn
公开号:EP2663400A1
公开(公告)日:2013-11-20
[EN] PROCESS OF MAKING MODIFIED METALLOCENE CATALYST, CATALYST PRODUCED AND USE THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UN CATALYSEUR MÉTALLOCÈNE MODIFIÉ, CATALYSEUR AINSI PRODUIT ET SON UTILISATION
申请人:GRACE W R & CO
公开号:WO2012097146A1
公开(公告)日:2012-07-19
Olefin polymerization catalysts or catalyst systems comprising a mixture, contact product, reaction product or complex comprising as elements or components: (A) at least one metallocene pre-catalyst compound or polymerization active metallocene compound; (B) at least one titanium containing metallocene compound; and when (A) is a metallocene pre- catalyst compound, (C) at least one activator; provided however: (I) the titanium-containing metallocene compound is inactive or substantially inactive for the polymerization of olefins prior to or concurrently with the use of the catalyst system for olefin polymerization. Also disclosed are processes for producing the catalyst system and polyolefins having desirable combinations of properties, including melt index and molecular weight distribution, which properties are particularly desirable for the manufacture of polyolefin film products, especially LLDPE film. A preferred catalyst comprises a zirconium or hafnium metal containing metallocene, an inactivated titanocene and a SiO2 support carrier.