摘要:
Disclosed herein are phosphine compounds represented by the general formula (4): and corresponding phosphonium salts represented by the general formula (4a): Also disclosed are processes for the preparation of these phosphines and phosphonium salts as well as their use as ligands in catalytic reactions.
摘要:
A phosphine compound represented by general formula (1) wherein R′ and R″ independently are selected from alkyl, cycloalkyl and 2-furyl radicals, or R′ and R″ are joined together to form with the phosphorous atom a carbon-phosphorous monocycle including at least 3 carbon atoms or a carbon-phosphorous bicycle; the alkyl radicals, cycloalkyl radicals, and carbon-phosphorous monocycle being unsubstituted or substituted by at least one radical selected from the group of alkyl, cycloalkyl, aryl, alkoxy, and aryloxy radicals; Cps is a partially substituted or completely substituted cyclopentadien-1-yl group, including substitutions resulting in a fused ring system, and wherein a substitution at the 1-position of the cyclopentadien-1-yl group is mandatory when the cyclopentadien-1-yl group is not part of a fused ring system or is part of an indenyl group. These phosphines can be used as ligands in catalytic reactions.
摘要:
A process is described for coproducing vinylidene alcohol and vinylidene olefin. The process involves dimerizing one or more vinylolefins with an alkyl aluminum catalyst to form a first product mixture comprising at least vinylidene olefin and alkyl aluminum compound. The vinylidene olefin is then reacted with the alkyl aluminum compound under displacement conditions to form 1-olefin while concurrently removing the 1-olefin from the displacement reaction mixture to form a second product mixture comprising at least beta-branched alkyl aluminum compound. The second product mixture is treated with air or oxygen under mild oxidation conditions to form a third product mixture comprising at least beta-branched aluminum alkoxide. The beta-branched aluminum alkoxide is then hydrolyzed to form vinylidene alcohol. The process makes effective use of the alkyl aluminum catalyst both as a catalyst and as a reactant, and requires only a relatively small amount of reaction equipment.
摘要:
An improved process for preparing an alkyl chain growth product by the chain growth reaction of .alpha.-olefin in an aluminum alkyl uses a catalyst system which comprises an actinide metallocene.
摘要:
A combined process for preparing alumina and alpha-olefins (.alpha.-olefins) is disclosed. The process comprises:(a) reacting tri-(C.sub.2 to C.sub.24) alkylaluminum with ethylene in the presence of nickel catalyst to form triethylaluminum and C.sub.2 to C.sub.24 .alpha.-olefins,(b) adding aluminum tri-(C.sub.4 to C.sub.8) alcoholate to the reaction product of step (a),(c) equilibrating the admixture of step (b) so that substantially all of the triethylaluminum is converted into aluminum ethyl alcoholates, compounds with at least one C.sub.4 to C.sub.8 alcoholate group per molecule,(d) subjecting the equilibrated mixture of step (c) to a fractionation to recover, (1) a C.sub.2 to C.sub.24 .alpha.-olefin fraction, and (2) an aluminum ethyl alcoholate fraction (a mixture of compounds with the general formula Al(C.sub.2 H.sub.6).sub.X (OC.sub.6 H.sub.13).sub.Y (where X is 0 to 2 and Y is 3 to 1) and X+Y=3).(e) adding C.sub.4 to C.sub.8 alcohol to the aluminum ethyl alcoholate fraction to form aluminum tri-(C.sub.4 to C.sub.8) alcoholate and ethane,(f) separating the ethane and aluminum tri-(C.sub.4 to C.sub.8) alcoholate by fractionation, and(g) hydrolyzing the aluminum tri-(C.sub.4 to C.sub.8) alcoholate to form C.sub.4 to C.sub.8 alcohols and the desired alumina,and process being characterized further in that preferably the tri-(C.sub.2 to C.sub.24) alkylaluminum is prepared by:(1) preparing triethylaluminum from aluminum, ethylene and hydrogen, in two stages, and(2) reacting with triethylaluminum of step (1) with ethylene to form tri-(C.sub.2 to C.sub.24) alkylaluminum.
摘要:
ALPHA OLEFINS ARE PRODUCED FROM ETHYLENE IN THE PRESENCE OF AN ORGANOMETALLIC CATALYST, SUCH AS TRIETHYLALUMINUM, SIDDOLVED IN DIISOBUTYLENE. DIISOBUTYLENE IS EASILY SEPARATED FROM THE DESIRED ALPHA OLEFIN PRODUCTS AND ITS PRESENCE INCREASES CATALYST AND REACTOR EFFICIENCIES.
摘要:
SOLID POLYMER FORMATION IN THE TRIALKYLALUMINUM CONVERSION OF ETHYLENE TO HIGHER ALPHA OLEFINS IS INHIBITED BY THE ADDITION OF VARIOUS UNSATURATED HYDROCARBON INHIBITORS. THE PRESENCE OF BUTAFIENE, FOR EXAMPLE, INHIBITS SOLID POLYMER FORMATION WITHOUT ANY SUBSTANTIAL ADVERSE EFFECT ON THE EFFICIENCY OF THE PROCESS.