Abstract
AbstractA novel molybdenum oxytetrachloride (MoOCl4)‐based ternary catalyst, molybdenum oxytetrachloride/diethylzinc/ethanol (MoOCl4Et2ZnEtOH), induces the living polymerization of o‐(trifluoromethyl)phenylacetylene. A catalyst composition of MoOCl4:Et2Zn: EtOH (mole ratio = 1:1:3) and anisole as polymerization solvent are favorable. The ratio of weight‐ to number‐average molecular weights Mw/Mn of the polymer was as small as 1,03, and the initiator efficiency was 8%. Living polymerization was verified by multistage polymerization. The polymerization proceeded in a living fashion in the temperature range from 0 to 30°C. The catalyst yielded polymers with small Mw/Mn values also from other phenylacetylenes with bulky ortho substituents and 1‐chloro‐1‐octyne.
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