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Synthesis of Benzotriazolyloxy tris [dimethyl-amino] phosphonium hexafluorophosphate (BOP) and Benzotriazolyloxy tris [pyrrolidino] phosphonium hexafluorophosphate (PyBOP), using triphosgene and hydroxybenzotriazole.
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Rivero et al. (1995) studied this question.
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