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(azapheny l)isocyanate in a benzene solution are investigated. Acetic acid and p olyethylene glycol esters of different molecular masses are used as ca talysts. The rate constants are calculated using the data for the asso ciation of carboxylic acids. It is shown that a monomolecular rearrang ement of a prereactional complex forms the final products. This comple x consists of one molecule each of n-butanol (or aniline), isocyanate, and carboxylic acid. According to the data on the catalysis by CH3COO H and Bu(3)SnOOCH(3), the catalytic activity of Sn(IV) compounds is dr astically decreased in the presence of carboxylic acids.