3458.     TROPSCH, H., AND KOCH, H.  [Synthetic Benzine From Water Gas.]  Brennstoff-Chem., vol. 10, 1929, pp. 337-346; Petroleum (London), vol. 26, 1930, pp. 157-158; Ges. Abhandl. Kenntnis Kohle, vol. 9, 1930, pp. 533-560; British Chem. Abs., 1929, B, p. 1003; Chem. Abs., vol. 24, 1930, p. 4919.

        Synthetic benzine obtained from water gas by catalytic reduction at atmospheric pressures was a mixture of 65% olefins, 0.1% benzine, 0.4-0.5% toluene and paraffins.  The saturated and unsaturated constituents were separated, isolated, and identified in various fractions of the carefully fractionated benzine; a modified Hg acetate method was used whereby pure olefins were obtained from mixtures containing saturated hydrocarbons.  The hydrocarbons thus obtained were pentane, hexane, heptane, octane, 3-methyloctane, nonane, 1-pentene, 2-pentene, 1 hexene, 2-hexene, 3,3-dimethyl-l-pentene, heptene, 2-octene, and nonene.  A long-needled crystalline substance melting 106, of unknown composition but possibly a γ-pyrone derivative, separated from the 100-120 fractions of the benzine.