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首页> 外文期刊>Catalysis science & technology >Coupling reaction between CO2 and cyclohexene oxide: selective control from cyclic carbonate to polycarbonate by ligand design of salen/salalen titanium complexes
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Coupling reaction between CO2 and cyclohexene oxide: selective control from cyclic carbonate to polycarbonate by ligand design of salen/salalen titanium complexes

机译：二氧化碳和环己烯之间的耦合反应：通过沙伦/萨拉伦钛合金配体设计从环状碳酸盐到聚碳酸酯的选择性对照

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摘要

Based on the mechanistic features of metal salen catalysis systems, titanium(IV) complexes from salen (salen-H2 = N,N-bis(3,5-di-tert-butylsalicylidene)-1,2-benzenediamine) and its half saturated form salalen have been prepared, which were used as catalysts in conjugation with bis(triphenylphosphino)iminium chloride ([PPN]Cl) for the coupling reaction of CO2 and cyclohexene oxide (CHO). The salen titanium complex (salen)Ti(IV)Cl2 showed moderate activity, producing a unique c/s-isomer of cyclic carbonate with high conversion up to 100% in 8 h, however, it could not catalyze the copolymerization reaction. Meanwhile, the salalen titanium complex (salalen)Ti(IV)Cl was effective for the copolymerization of CO2 and CHO, where only one chain grew on Ti during the chain propagation reaction, yielding completely alternating copolymers with -OH and -Cl as terminal groups. Moreover, the nearly complete conversion of CHO indicated that (salalen)Ti(IV)Cl might be used to synthesize muttiblock poly(cyclohexene carbonate)s with controllable sequences.
机译：基于金属沙质催化系统的机械特征，来自Salen（Salen-H2 = N，N-Bis（3,5-二甲基叔丁基甲基油脂））的钛（IV）复合物-1,2-苯甲胺）及其一半饱和已经制备了salalen的形式，它们与BIS（Triphenylphosphino）氯化物（[PPN] CL）共轭用作催化剂，以用于CO2和环己烯氧化物（CHO）的偶联反应。 Salen Titanium络合物（Salen）Ti（IV）CL2表现出适度的活性，产生了独特的环状碳酸盐C/S-异构体，高转化率在8小时内高达100％，但是，它无法催化共聚反应。同时，Salalen钛复合物（salalen）Ti（IV）CL对CO2和CHO的共聚是有效的，在链繁殖反应过程中，只有一个链在Ti上生长，与-OH和-OH作为末端组完全交流了共聚物， 。此外，几乎完整的CHO转化表明（Salalen）Ti（IV）Cl可以使用可控序列合成具有可控序列的杂种块聚（环己烯碳酸盐）。

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