2424.     ---------------.  [NEGISHI, R., AND KAMIIKE, O.]  Hydrocarbons From Carbide.  VI.  Noncatalytic Polymerization Under Ordinary Pressure – Consideration and Comparisons Between Nascent and Ordinary Acetylene Polymerizations.  Jour. Soc. Chem. Ind. (Japan), vol. 45, suppl. binding, 1942, p. 47 (in English); Chem. Abs., vol. 44, 1950, pp. 10299-10300.

        Main reaction of nascent C₂H₂ is probably nC₂H₂=C_2nH_2n to form principally aromatic and condensed aromatic compounds.  The efficiency of the polymerization of nascent C₂H₂ from carbide is higher than that of ordinary C₂H₂ in the presence of an active catalyst.  Because of the high reactivity of nascent C₂H₂, carbide may be used to accelerate certain sluggish reactions.  Note should be made of the fact that the polymerization of nascent C₂H₂ is difficult to stop at a specific point and that the heat of reaction involving carbide is very high.