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Benzyltriphenylphosphonium tribromide(BTPTB) has been applied as an efficient catalyst for the preparation of bis(indolyl)-methanes (BIMs) via electrophilic substitution of indoles with aldehydes in the absence of solvent.
Benzyltriphenylphosphonium tribromide (BTPTB) has been applied as an efficient catalyst for the preparation of bis (indolyl) -methanes (BIMs) via electrophilic substitution of indoles with aldehydes in the absence of solvent.