Novel Mn/O ion pair catalysts and preparation method of catalysts

Abstract

The invention belongs to the field of epoxidation catalysts, and discloses novel Mn / O ion pair catalysts and a preparation method of the catalysts. The preparation method comprises synthesizing organic copolymer PS-PVPA with different polymerization degrees by regulating and controlling different proportions of styrene and styrene phosphonic acid; preparing NLZPS-PVPA carrier materials which have controllable interlamellar spacing sizes through composition of the synthesized PS-PVPA and inorganic zirconium phosphate by using a monomer in situ intercalation polymerization method; and synthesizing a series of homogeneous-phase ACDC Mn / O ion pair catalysts. According to the invention, with the comparison with a conventional Mn(salen) catalyst, the effects of chiral coordination anions, chiral source locations, nonoamine skeletons and the like in novel chiral Mn / O ion pair catalysts on the catalysis effects in homogeneous-phase / heterogeneous asymmetric epoxidation are revealed, novel catalysts which are more reasonable are designed, so that the way of thinking is expanded for perfecting the prior research and further understanding of epoxidization processes.

Description

technical field [0001] The invention belongs to the field of epoxidation catalysts, in particular to a novel Mn / O ion pair catalyst and a preparation method thereof. Background technique [0002] The traditional chiral Mn(salen) (referred to as Jacobsen'catalyst) catalyst has been proved to be one of the most effective catalysts for the asymmetric epoxidation of olefins. The chiral center of the catalyst is located on the diamine skeleton on the salen ligand, and the coordination counter anion is an achiral ion. By modulating the electronic and steric effects on the benzene ring in the salen ligand, olefins can be efficiently catalyzed Oxidation to chiral epoxy compounds. Then through selective ring opening or transformation of functional groups, a series of valuable chiral compounds can be obtained, such as chiral diols, thiols, and chiral alcohols substituted by cyano and alkoxy groups, which are widely used in medicine, In the synthesis of fine chemicals such as pestici...

AI Technical Summary

Problems solved by technology

[0006] To sum up, the problems existing in the existing technology are: there are no research reports on the immobilization of homogeneous chiral Mn / O ion pair catalysts through different supports at home and abroad, and there is no specific study on the immobilization of chiral Mn / O ion pair catalysts on NLZPS–PVPA side chains. After the O ion is on the catalyst, the influence of the threshold effect of the nano-layer interlayer on the epoxidation reaction results is studied; the copolymers with different degrees of polymerization have differences in water solubility, structure and other properties, resulting in fixed styrene and styrene phosphonic acid feeding. than there are defects;

[0008] In the existing composite of PS–PVPA and inorganic zirconium phosphate, the surface morphology caused by the amorphous carrier ZPS–PVPA is difficult to control, and then the catalytic sites are unevenly distributed after the immobilization of chiral ligands, and even exist simultaneously in one catalyst molecule. There are defects in multiple active catalytic centers such as the surface and the interlayer surface;

[0009] There are many reports on the electronic and steric effects of the salen ligand, and the modulation of the chiral diamine skeleton, but there are few reports on the effects of epoxidation catalytic results by regulating the properties of the coordination anion, the position of the chiral source, and the monoamine skeleton. Few; there is insufficient understanding of the existing homogeneous epoxidation reaction mechanism;

[0010] In the prior art, a lot of scientific research has been done on the impact of the special nano-threshold effect produced by the nanopores of the carrier MCM-41 and the interlayer of LDHs on asymmetric catalysis, but there is no research on the "research on NLZPS-PVPA interlayer threshold effect". effect on asymmetric epoxidation reactions, not reported

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