摘要:
The invention concerns a catalytic composition and a process for the dimerization, codimerization or oligomerization of olefins, said composition comprising a mixture of at least one bivalent nickel complex which contains two tertiary phosphine molecules, at least one nickel compound or complex compound which contains neither water nor phosphine, and at least one alkylaluminum halide. The mixture is particularly for use in ionic type non aqueous liquid compositions, such as those formed by quaternary ammonium halides and/or quaternary phosphonium halides with aluminum halides and/or alkylaluminum halides.
摘要:
The invention concerns a catalytic composition and a process for the dimerisation, codimerisation or oligomerisation of olefins, said composition comprising a mixture of at least one bivalent nickel complex which contains two tertiary phosphine molecules, at least one nickel complex which contains neither water nor phosphine, and at least one alkylaluminium halide. The mixture is particularly for use in ionic type non aqueous liquid compositions, such as those formed by quaternary ammonium halides and/or quaternary phosphonium halides with aluminium halides and/or alkylaluminium halides.
摘要:
The invention is concerned with a process for the dimerization, co-dimerization and oligomerization of olefins with a catalytic composition resulting from mixing at least one quaternary ammonium halide and/or at least one quaternary phosphonium halide, at least one aluminum halide, at least one aromatic hydrocarbon and optionally an aluminium organometallic compound.
摘要:
The invention is concerned with a catalytic composition resulting from dissolving a nickel complex mixed or complexed with a tertiary phosphine in the medium resulting from mixing at least one quaternary ammonium halide and/or at least one quaternary phosphonium halide, at least one aluminum halide, at least one aromatic hydrocarbon and optionally an aluminum organometallic compound. The invention is also concerned with a process for the dimerization, codimerization and oligomerization of olefins with this composition.
摘要:
The present invention describes the process of producing biopolymeric membranes and the membranes obtained by this process. Particularly, the biopolymeric membranes of the present invention comprise poly(urethane-caprolactone) and can be used for nerve and bone regeneration.