"A Minireview of Phase-Transfer Catalysis and Recent Trends"

Abstract

Phase-Transfer Catalysis; PEG: Polyeth-ylene Glycol; TBAB: Tetrabutylammoni-um Bromide To date, temperature-controlled phase-transfer catalyst, supported phase-transfer catalyst, and hydrogen bond phase-transfer catalyst are regarded as alternatives to traditional phase-transfer catalyst such as onium salt crown ether and polyether phase-transfer catalyst, have drawn significant attention from related scientists owing to their excellent properties, including nontoxicity, well-cycling performance, low cost, and facile synthesis. Especially, supported phase-transfer catalyst can not only overcome the poor solubility of heterogeneous systems came out but also can be reused many times and have been successfully applied in numerous technological fields. The influx of different novel recyclable phase-transfer catalysts is essential to overcome traditional phase-transfer catalyst's large consumption, environmental pollution, difficulty in recycling, and high toxicity. Herein, this mini-review sum up recent advances in the organic synthesis of novel phase-transfer catalysts and their promising applications.