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Reverse-flow adsorption for process-integrated recycling of homogeneous transition-metal catalysts

机译：逆流吸附用于均相过渡金属催化剂的工艺集成回收

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摘要

Supramolecular strategies, based on hydrogen bonds and ionic interactions, were investigated as tools for the recovery and recycling of homogeneous transition-metal catalysts by using reverse-flow adsorption (RFA) technology. The association (in solution) and adsorption (on support) of new functionalized host materials and phosphine guest ligands, functionalized with the complementary binding motifs, were fine-tuned for the application of these materials in a RFA reactor. The RFA technology for process-integrated recycling of homogeneous catalysts using these tailor-made phosphine ligands and silica-supported host materials resulted in a stable, semicontinuous catalytic system. Rhodium-catalyzed asymmetric hydrogenation of methyl acetamidoacrylate and asymmetric hydrosilylation of acetophenone were studied as test reactions. Depending on the catalytic process the metal complex could be recycled several times without significant loss in conversion.
机译：研究了基于氢键和离子相互作用的超分子策略，作为利用逆流吸附（RFA）技术回收和再循环均相过渡金属催化剂的工具。对新的功能化主体材料和用互补结合基序功能化的膦客体配体的结合（在溶液中）和吸附（在载体上）进行了微调，以将这些材料应用于RFA反应器。使用这些量身定制的膦配体和二氧化硅负载的基质材料，RFA技术用于均相催化剂的过程集成回收，可形成稳定的半连续催化体系。研究了铑催化的乙酰氨基丙烯酸甲酯的不对称氢化和苯乙酮的不对称氢化硅烷化。根据催化过程的不同，金属配合物可以循环使用几次而不会造成转化率的显着损失。

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