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=C2nH2n 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.