2417.     ----------------.  [NEGISHI, R., AND KAMIIKE, O.]  Hydrocarbons From Carbide.  IV.  Noncatalytic Polymerization Under Ordinary Pressure.  Acetylene Carbide System and General Remarks.  Bull. Chem. Soc. Japan, vol. 17, 1942, pp. 345-354; Chem. Abs., vol. 41, 1947, p. 4435.

        Results of the series of investigations, on the systems H2, CO2, CO, HCl, and C2H2 with CaC2 are given; CO has a harmful effect, although CO2 has a beneficial effect; HCl gives somewhat harmful effects only when its concentration is high; and C2H2 increases the total yield because it polymerizes.  When C2H2 is diluted with an inert gas, such as H2 or CO2, its effect on the total liquid yield disappears; the presence of a small amount of C2H2 has a striking effect on the suppression of the formation of free C2H2.  [The nascent C2H2 molecules, which related to polymerization, are suggested to have the structure n(C2H2)=(C2H2)n.]  There are indications that the efficacy of the synthesis of hydrocarbon liquids from CaC2 is higher than even the catalytic polymerization.