Study of the reactivity of ammonium carboxylates in the synthesis of amides under high-pressure deformation conditions

Autor: Chistotina, N. P., Zharov, A. A.
Zdroj: Russian Chemical Bulletin; October 1989, Vol. 38 Issue: 10 p2103-2106, 4p
Abstrakt: On deformation under pressures up to 10 GPa the ammonium salts of aliphatic and aromatic acids, as well as mixtures of a free carboxylic acid with the ammonium salts of strong mineral acids, are converted into the corresponding amides. The amide yields increase with pressure, the magnitude of shearing deformation, and temperature. The temperature and pressure coefficients for amide formation are low and have values of 2.5–4 kJ/mole and -1 to -2 cm3/mole, respectively. The reactivity of ammonium salts in the synthesis of amides alternates in the homologous series of aliphatic acids in a similar way to the shear stress of these salts. The reactivity of the ammonium salts of aliphatic acids increases when the reaction is conducted in a matrix of an ammonium salt which possesses plasticity and a high shear stress.
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