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- [2] STUDIES ON REACTIONS OF N-PHOSPHONIUM SALTS OF PYRIDINES .1. NEW METHOD FOR ACTIVATION OF CARBOXYLIC-ACIDS VIA N-PHOSPHONIUM SALTS BY MEANS OF OXIDATION OF TRI-ESTERS AND DI-ESTERS OF PHOSPHORUS ACID IN PRESENCE OF TERTIARY-AMINES BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 1973, 46 (04) : 1235 - 1238