MOLECULAR-ORGANIZATION OF REAGENTS IN KINETICS AND CATALYSIS IN LIQUIDS .3. CATALYSIS OF URETHANE AND UREA FORMATION BY CARBOXYLIC-ACIDS

Kinetics of the reaction of n-butanol and aniline with phenyl(azaphenyl)isocyanate in a benzene solution are investigated. Acetic acid and polyethylene glycol esters of different molecular masses are used as catalysts. The rate constants are calculated using the data for the association of carboxylic acids. It is shown that a monomolecular rearrangement of a prereactional complex forms the final products. This complex consists of one molecule each of n-butanol (or aniline), isocyanate, and carboxylic acid. According to the data on the catalysis by CH3COOH and Bu(3)SnOOCH(3), the catalytic activity of Sn(IV) compounds is drastically decreased in the presence of carboxylic acids.