ArM(CO)3(Ar = arene; M = Cr, Mo, W) catalyses the polymerization of alkynes to relatively high molecular weights, which proceeds through an intermediate which has been isolated and identified as a ladder compound composed of fused cyclobutane rings; the final product is the linear, polyconjugated poly-(acetylene).
M. F. Farona, P. A. Lofgren and P. S. Woon, J. Chem. Soc., Chem. Commun., 1974, 246 DOI: 10.1039/C39740000246
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