Abstract
Mo(NO) 2(O 2CR) 2–Lewis acid catalysts (Lewis acid=TiCl 4, SnCl 4, EtAlCl 2; R=phenyl, methylvaleric, ethylhexanoic) induce monosubstituted acetylenes (phenylacetylene, tert-butylacetylene) to polymerize. The catalytic ability of these catalyst strongly depends on the Lewis acid and solvent. The system with SnCl 4 in benzene is almost selective in polymerization of phenylacetylene (conversion: 60%, yield of polymer 56%) while in toluene cyclotrimers are the main products (conversion: 70%, yield of cyclotrimers: 69%). However, the TiCl 4 system trimerized phenylacetylene in PhCl solution (conversion: 76%, yield of cyclotrimers: 66.5%). The structure of obtained polymers and mechanisms of polymerization and cyclotrimerization reactions were determined.
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