Thermally induced polymerization and copolymerization with styrene of diazoketones in the presence of benzoquinone

Thermally induced polymerization of diazoketones, ( E )-1-diazo-3-nonen-2-one 1 and ( E )-1-diazo-4-phenyl-3-buten-2-one 2 , is described. Heating 1 and 2 in a solvent at 60–100 °C afforded polymers, where all the main chain carbons bear acyl groups derived from the monomers and the main chain contains ca. 25–35 mol% of azo group. Molecular weight of the resulting polymers increased up to M n = 8,400 by the addition of benzoquinone to the reaction mixtures. The polymerization was supposed to proceed via radical propagating chain end and copolymerization of 1 with styrene gave copolymers ( M n = 11,000–15,000) having acylmethylene, azo group, and repeating unit from styrene in their main chains.