Salen catalyst for optical polymerization reaction of racemic propylene oxide and preparation method of salen catalyst

Abstract

The invention relates to a salen catalyst for an optical polymerization reaction of a racemic propylene oxide and a preparation method of the salen catalyst. A novel chiral dinuclear Salen complex is synthesized by using 3,5-di-tert-butyl-salicylaldehyde and 3,3 '-dihydroxybiphenyl and (R, R)-cyclohexanediamine as raw materials. The adopted prepared Salen catalyst can initiate the optical polymerization reaction of the racemic propylene oxide, and synchronously realize the resolution of the propylene oxide and the catalytic synthesis of a highly ordered opticalactive polymerization product.

Description

technical field [0001] The invention relates to a salen catalyst for optical polymerization of racemic propylene oxide and a preparation method thereof. Background technique [0002] Propylene oxide is an important organic chemical product. The molecular structure of propylene oxide contains a chiral carbon atom. Using propylene oxide as a raw material, it can be polymerized to obtain an optically active polymer with optical activity. The synthesis method of this type of optically active polymer mainly includes two categories, one is the polymerization of chiral monomers; the other is the optical polymerization of racemic propylene oxide. At present, more than 2 / 3 of the world's propylene oxide monomers are converted into propylene oxide polymerization products every year, but there are almost no optically active polymers. The reasons for this situation are, on the one hand, the high cost of optically active pure propylene oxide raw materials, and on the other hand, the la...

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Problems solved by technology

Although these catalytic initiation systems have greatly promoted the research on the optical polymerization of propylene oxide, they generally have the disadvantages of complex preparation of the initiation system, low efficiency of the catalytic system, sensitivity to moisture, difficult operation, low enantioselectivity, and poor polymerization. The disadvantages such as low tacticity of the product make the optically active polymer obtained by the reaction and the unreacted optically active propylene oxide unable to achieve sufficient optical purity and optical activity, which greatly affects their performance research and practical use. value

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