An alternative concept for the recycling of homogeneous catalysts has been developed, which combines the aspects of the two-phase technique with the principles of thermo-regulated phase-transfer catalysis. Special temperature-dependent multicomponent solvent systems make it possible to carry out a single-phase reaction by repression of the miscibility gap at reaction temperature and guarantee an easy catalyst/product separation by the two-phase technique at room temperature.
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Behr et al. (2002) studied this question.