The first homogeneous catalytic system for the efficient reversible dehydrogenation-hydrogenation reactions of nitrogen heterocycles in one flask has been developed using the pyridonate Cp*Ir complex as the single catalyst at relatively low temperature. The reversible catalytic reactions proceed with the reversible interconversion of catalytic species and can be nearly quantitatively repeated five times with almost no loss of efficiency. The remarkable feature of the present homogeneous catalytic system is that the reversible dehydrogenation-hydrogenation reactions proceed with the reversible interconversion of the catalytic species, depending on the absence or presence of hydrogen.

ABSTRACT:A new activating agent for amide condensations, diphenyl 2,3-dihydro-2-oxo-3-benzothiazolyl phosphate, was prepared by the reaction of 2(3H)-benzothiazolone with diphenyl phosphorochloridate in the presence of triethylamine in acetonitrile at room temperature. The new activating agent was found to be useful for the preparation of amides from carboxylic acids and amines. The direct polycondensation of dicarboxylic acids with aromatic diamines using the activating agent in the presence of triethylamine proceeded at room temperature to produce polyamides with inherent viscosities up to 1

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