2423.     NEGISHI, R., AND KAMIIKE, O.  Hydrocarbons From Carbide.  V.  Noncatalytic Polymerization Under Ordinary Pressure – Acetylene-Carbide Systems.  Jour. Soc. Chem. Ind. (Japan), vol. 45, suppl. binding, 1942, p. 46 (in English); Chem. Abs., vol. 44, 1950, p. 10299.

        Effects of C₂H₂ used as a carrier of water vapor on the liquid yield were studied in the hope that the total liquid yield might be increased by the polymerization of the introduced C₂H₂ and, further, that by its introduction, the formation of free C₂H₂ from the carbide might be suppressed, thus permitting the nascent C₂H₂ to become more readily available for the liquid synthesis.  when the concentration of C₂H₂ was high, the total liquid yield also was high, showing that a part of the introduced C₂H₂ was polymerized.  When its concentration was reduced, for example, by diluting it with H₂, or CO₂, the yield fell.  In the presence of C₂H₂ mol., the formation of free C₂H₂ from the carbide is suppressed.