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Abstract
The activating effect of acetylenic compounds for the polymerization of phenylacetylene by molybdenum (V) chloride. The alkyl and aromatic terminal acetylenes were found to activate the MoCl5 for the polymerization of phenylacetylene. The terminal acetylenes having acidic hydrogen (functional group: carboxylic acid, hydroxy) also activate the MoCl5 catalysts. On the other hand, the polymerization of phenylacetylene using MoCl5-acetylenic amines did not proceed.