- Synthesis method of polyketone ligand 1, 3-bis[bis(2-methoxyphenyl)phosphino]propane
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Belonging to the technical field of fine chemical engineering, the invention relates to a synthesis method of polyketone ligand 1, 3-bis[bis(2-methoxyphenyl)phosphino]propane. The synthesis method includes the step of: a) reacting anisole with tetraethylp
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Paragraph 0025; 0046; 0051-0054; 0058-0060; 0064-0066; 0070-
(2020/01/25)
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- On Ni catalysts for catalytic, asymmetric Ni/Cr-mediated coupling reactions
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The importance of the Ni catalyst in achieving catalytic asymmetric Ni/Cr-mediated coupling reactions effectively is demonstrated. Six phenanthroline-NiCl2 complexes 1a-c and 2a-c and five types of alkenyl iodides A-E were chosen for the study, thereby demonstrating that these Ni catalysts display a wide range of overall reactivity profiles in terms of the degree of asymmetric induction, geometrical isomerization, and coupling rate. For three types of alkenyl iodides A-C, a satisfactory Ni catalyst(s) was found within 1a-c and 2a-c. For disubstituted (Z)-alkenyl iodide D, 2c was identified as an acceptable Ni catalyst in terms of the absence of Z → E isomerization and the degree of asymmetric induction but not in terms of the coupling rate. Two phosphine-based Ni catalysts, [(Me)3P]2· NiCl2 and [(cy)3P]2·NiCl2, were found to meet all three criteria for D. The bond-forming reaction at the C16-C17 position of palytoxin was used to demonstrate the usefulness of the Ni catalysts thus identified.
- Liu, Xiang,Li, Xiaoyong,Chen, Yu,Hu, Yimin,Kishi, Yoshito
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p. 6136 - 6139
(2012/05/07)
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- Polymerization process
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In the process of producing a linear alternating polymer of carbon monoxide and at least one ethylenically unsaturated hydrocarbon in the presence of a palladium salt, the anion of a strong non-hydrohalogenic acid, and a phosphine ligand, improved polymerization rates are obtained when employing a novel catalyst composition formed from a novel 1,3-bis(phosphino)-2-silapropane, which can be produced with high yield, wherein the 2-silapropane moiety is additionally substituted at the silicon atom with two hydrocarbyl substituents.
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- Preparation of tetraaryldiphosphines
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Tetraaryldiphosphines of the general formula (R1)2P-R-P(R1)2, wherein R1 represents an aryl group carrying at least one alkoxy substituent in a position ortho in respect to the phosphorus atom to which the aryl group is bound and R is a bivalent bridging group containing at least two carbon atoms in the bridge, are prepared by contacting hexaaryldiphosphonium compounds in the presence of an aprotic diluent with an alkali metal aluminium tetrahydride or with a compound derivable therefrom by replacing one, two or three hydrogen atoms with the same or different groups -OR2, wherein R2 is an alkyl or alkoxyalkyl group.
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- Bisphosphine production
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Bis[di(alkoxyphenyl)phosphino]alkanes are produced by reacting an alkoxyphenyl Grignard with phosphorus trichloride and converting the resulting di(alkoxyphenyl)phosphorus chloride to the corresponding phosphine. The di(alkoxyphenyl)phosphine is reacted w
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