| Abstract: | Anionic copolymerization of p-anisaldehyde (ANA) with dimethylketene (DMK) was made with use of benzophenone–dilithium complex as an initiator at ?78°C in a high vacuum. In spite of a copolymerization in such a good polar solvent as tetrahydrofuran, the composition of the copolymer was nearly exactly 1 : 1 over a quite wide range of the monomer feed. From the analytical data of the product after the hydrogenolysis of the copolymer with lithium aluminum hydride, the copolymer was found to have a structure resulting from the alternating addition of the C?O double bond of ANA to the C?C double bond of DMK. No copolymerizations of ANA with phenyl isocyanate and methyl isocyanate take place under the same conditions. |
