3760.     ZELINSKIĬ, N. D.  [New Syntheses of Hydrocarbons From Carbon Monoxide.]  Doklady Akad. Nauk S.S.S.R., vol. 60, 1948, pp. 235-237; Chem. Abs., vol. 42, 1948, p. 6510.

        Occurrence of free CH₂ radicals in the Fischer-Tropsch synthesis is considered demonstrated by the methylation of C₆H₆ introduced into the reaction mixture, to PhMe, and the proof that these radicals actually originate from CO+H₂.  Comparative kinetic studies of the rates of formation of hydrocarbons from CO+H₂, of formation of carbide in the reaction between CO and the catalyst, and of the reduction of the carbides by H₂, have demonstrated that intermediate carbide formation plays a role only on Fe catalysts, not on Co and on Ni.  The Fischer-Tropsch reaction proceeds by way of the intermediate radical CHOH and CHOH+H₂→H₂+CH₂.  Closely related to this mechanism is the catalytic hydrocondensation of CO with olefins (C₂H₄, C₃H₆, C₄H₈, etc.) to saturated and unsaturated aliphatic hydrocarbons, and the catalytic hydropolymerization of olefins to saturated and unsaturated aliphatic hydrocarbons, occurring only in the presence of some (5-7%) CO.  It is obvious that these reactions are determined by intermediate formation of CH₂ radicals.  (See abs. 785, 792, 795, and 3761.)

        ----------.  See abs. 793, 794, 795, 796, 797, 798, 799, 800, 801, 802, 802b, 802c, 803, 1704, 1705, 2916, 3558.