The cyclopolymerization of 2-butynyl-propargyl ether and 3-trimethylsilyl-2-propynyl propargyl ether and its copolymerization with diethyl dipropargyl malonate (DEDPM) were carried out by various transition metal catalysts. MoCl5-based catalyst was found to be very effective and gave high polymer yields. The resulting homopolymers were insoluble in organic solvents, whereas copolymers showed good solubility in organic solvents such as chloroform, tetrahydrofuran, and dimethylsulfoxide. The structure of the products was confirmed by IR, NMR, and UV-visible spectroscopies. From the spectral data it is proposed that mainly cyclized products with conjugated systems are formed. Thermal and morphological properties were also studied.
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Lee et al. (1995) studied this question.
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