摘要:
Bidentate phosphine ligands of the formula wherein the substituents are as defined in the specification and a process for preparing linear aldehydes by hydroformylating internal olefins using such phosphine ligands.
摘要:
Process for the preparation of an aldehyde through hydroformylation of an unsaturated organic compound in the presence of a catalyst system comprising rhodium of iridium and a multidentate organic phosphite ligand, wherein a monodentate phosphine is present.The process according to the invention can advantageously be carried out for the preparation of methyl-5-formylvalerate, which is an intermediate product in the preparation of a caprolactam or adipic acid, which are in turn raw materials for the preparation of nylon-6 and nylon-6,6, respectively.
摘要:
A process for the preparation of copolymers which comprises reacting carbon monoxide and one or more ethylenically unsaturated compounds under polymerization conditions in the presence of a catalyst system comprising:(a) at least one metal selected from the Groups VI, VII and/or VIII of the Periodic Table; and(b) a stabilizing organic compound attached to (one of) the said metal(s) and containing at least one group capable of forming an additional, non-covalent, bond with (one of) the said metal(s).Also disclosed are products made by the process of the invention, and novel complexes of the general formula [LPdQ] [A].sub.n, wherein Q stands for 2-acylnorborn-1-yl, 2-acylnorborn-3-en-1-yl or a 2-acylethyl group, n is 0 or 1, A stands for a weakly or non-coordinating anion and, if n is 1, L stands for bidentate ligand of the general formula R.sup.1 R.sup.2 M.sup.1 --R--M.sup.2 R.sup.3 R.sup.4, wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 independently represent substituted or nonsubstituted hydrocarbyl groups, M.sup.1 and M.sup.2 independently represent phosphorus, arsenic, antimony or nitrogen and R represents a divalent organic bridging group containing at least one carbon atom in the bridge, or, if n =0, L stands for a sulfonate anion of the general formula R.sup.8 R.sup.9 P--R.sup.10 --SO.sup.-.sub.3 wherein R.sup.8 and R.sup.9 independently represent substituted or non-substituted hydrocarbyl groups and R.sup.10 represents an organic bridging group having 1-4 carbon atoms in the bridge.
摘要:
An improved process for the production of linear alternating polymers of carbon monoxide and at least one ethylenically unsaturated hydrocarbon employs a novel catalyst composition formed from a compound of palladium, the anion of a strong non-hydrohalogenic acid and a novel hexakis phosphine ligand. The process is characterized by a lessened degree of reactor fouling.
摘要:
A process for the preparation of a primary or secondary alcohol, which comprises hydrogenating respectively an aldehyde or ketone in the presence of a catalyst system comprising a platinum compound, an acid having a pKa in the range from about 2 to about 10.5 and a phosphorus compound of the formula R.sup.1 R.sup.2 POH, wherein R.sup.1 and R.sup.2 each independently represents an alkyl group or a phenyl group, at a temperature in the range from about 20.degree. to about 150.degree. C. and at a pressure in the range from about 1 to about 100 bar.
摘要:
An improved process for the production of linear alternating polymers of carbon monoxide and at least one ethylenically unsaturated hydrocarbon employs a catalyst composition formed from a palladium salt and a phosphino-substituted sulfonic acid.
摘要:
1,5-Dimethyl-1,5-cyclooctadiene and 1,4-dimethyl-4-vinyl-1-cyclohexene are prepared by contacting isoprene with a catalyst obtained by mixing a nickel compound, a reducing agent capable of reducing the nickel to zerovalent nickel, and a trihydrocarbyl phosphite, arsenite or antimonite wherein at least one of the three hydrocarbyl groups is a substituted hydrocarbyl group CF.sub.3 --(CF.sub.2).sub.n C(H)(R)--, in which n.gtoreq.0 and R is an optionally substituted hydrocarbyl group. Only very small amounts of the undesired 1,6-dimethyl-1,5-cyclooctadiene are formed.
摘要:
A process for the preparation of copolymers of carbon monoxide and one or more ethylenically unsaturated compounds by contacting the monomers, under polymerization conditions, with a catalyst system comprising a) a source of cations of one or more metals of Group VIII of the Periodic Table and b) a bidentate ligand, and c) a minor amount of a compound containing a hydride moiety. Copolymers made by this process generally have low molecular weights.
摘要:
An improved process for the production of linear alternating polymers of carbon monoxide and at least one ethylenically unsaturated hydrocarbon of at least 3 carbon atoms employs a novel catalyst composition formed from a palladium compound, the anion of a strong non-hydrohalogenic acid, an aliphatic bidentate ligand of phosphorus and a polyalkoxyalkane.
摘要:
An improved process for the production of linear alternating polymers of carbon monoxide and at least one ethylenically unsaturated hydrocarbon comprises contacting under polymerization conditions the carbon monoxide and hydrocarbon in the presence of a catalyst composition formed from a compound of certain Group VIII metals, e.g., palladium, an anion of a non-hydrohalogenic acid having a pKa above about 2 but below about 6, and a bidentate ligand of phosphorus wherein at least one of the monovalent phosphorus substituents is aromatic and substituted in a position ortho to the phosphorus with a polar substitutent.