Membrane-Supported Recovery of Homogeneous Organocatalysts: A Review by Péter Kisszékelyi Sándor Nagy Zsuzsanna Fehér Péter Huszthy & József Kupai
Author:Péter Kisszékelyi, Sándor Nagy, Zsuzsanna Fehér, Péter Huszthy & József Kupai
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Tags: As catalysis plays a significant role in the development of economical and sustainable chemical processes, increased attention is paid to the recovery and reuse of high-value catalysts. Although homogeneous catalysts are usually more active and selective than the heterogeneous ones, both catalyst recycling and product separation pose a challenge for developing industrially feasible methods. In this respect, membrane-supported recovery of organocatalysts represents a particularly useful tool and a valid option for organocatalytic asymmetric synthesis. However, catalyst leaching/degradation and a subsequent decrease in selectivity/conversion are significant drawbacks. As the effectivity of the membrane separation depends mainly on the size of the catalyst in contrast to the other solutes, molecular weight enlargement of small organocatalysts is usually necessary. In the last few years, several synthetic methodologies have been developed to facilitate their recovery by nanofiltration. With the aim of extending the possibilities for the membrane-supported recovery of organocatalysts further, this contribution presents a review of the existing synthetic approaches for the molecular weight enlargement of organocatalysts., organocatalyst; organic solvent nanofiltration; size-enlargement; molecular weight enlargement; catalyst recovery
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