Über Derivate des Poly-α-chloracroleins. II. Dehydrochlorierung von Poly(α-chloracroleindimethylacetal-co-vinylchlorid) und Poly-α-chloracroleindiacetat mit Basen

Dehydrochlorination of poly(vinylchloride-co-α-chloroacroleindimethylacetale) by sodium amide in ammonia or tetrahydrofuran leads to insoluble products below chlorine contents of 36.5% Soluble products down to chlorine contents of 10% were found by applying potassium tert-butylate. The rate of dehydrochlorination is practically independent of the copolymer composition. At high concentrations of the base, the rate is a function of chlorine concentration only at low degrees of dehydrochlorination, but of base concentration only at high conversion. The unusual exponents of 3.3 for chlorine concentration and 4.3 for base concentration resp. were found for these limiting cases. Below chlorine contents of 34%, the heptaene-sequence was found to have the highest absorption. No influence of reaction temperature on sequence distribution could be detected. Diene and triene, sequences are present in the highest mole concentrations at all stages of the reaction.