HYDROLYSIS AND BIOLOGICAL-ACTIVITY IN A S ERIES OF WATER-SOLUBLE POLYMERIC ESTERS OF ARYL-CONTAINING CARBOXYLIC-ACIDS

It was established that the rate of alkaline hydrolysis of polymeric e sters of a number of monocarboxylic acids falling into the category of plant growth regulators of the auxin group (2,4-dichlorophenoxyacetic , 1-naphthylacetic, 2-naphthoxyacetic, and 2-naphthylthioacetic) decre ases as the strength of the acid decreases and the molecular mass of t he polymer increases. The presence of side carbonyl groups also reduce s the rate of hydrolysis. Using polymeric esters of 2,4-dichlorophenox yacetic acid as an example, it was shown that, for the polymers with l ow rates of hydrolysis, the zone of the maximum stimulating activity s hifts to the region of higher concentrations.