Ytterbium perfluorooctanesulfonate [Yb(OPf)3] catalyses the highly efficient synthesis of 2,3‐dihydro‐1H‐1,5‐benzodiazepines in fluorous solvents. By simple separation of the fluorous phase containing only the catalyst, the reaction can be repeated several times.
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Yi et al. (2007) studied this question.
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