SYNTHESIS OF A LINEAR POLYMER WITH TRIACE TYLMETHANE FRAGMENTS AND STUDY OF KETO-ENOLE TAUTOMERISM IN THE POLYMER BACKBONE

A reaction of the C-acylation of Na-derivatives of beta-ketoesters was used for the first time and a polymer containing triacylmethane group s was obtained. The results of H-1 and C-13 NMR measurements showed th at a repeating unit of the polymer has a structure similar to dibenzoy lacetic ester and exists in three tautomeric forms, including a ketone and two enole forms. The latter forms have intramolecular hydrogen bo nds between the enole benzoyl group and the ester group (main tautomer ) or between the two enole benzoyl groups. The proportion of enole for ms decreases upon going from a solid polymer to solutions.