2692.     PICHLER, H., ZIESECKE, K. H., AND TITZENTHALER, E.  [Composition of Hydrocarbons From Isosynthesis.]  Brennstoff-Chem., vol. 30, 1949, pp. 333-347; Chem. Abs., vol. 44, 1950, p. 815.

        Benzine fraction was found to consist predominantly of branched paraffins and naphthenes.  The principal synthesis products boiling up to 100° were methylbutane, 2-methylpentane, 2.3-dimethylbutane, 2.4-dimethylpentane, 2-methylhexane, 3-methylhexane, 2.3-dimethylpentane, methylcyclopentane, dimethylcyclopentane, and methylcyclohexane.  Small amounts of unbranched paraffinic and naphthenic hydrocarbons were found as well as examples of the quarternary C-atom, neohexane, and homologous heptanes.  the olefin and aromatic contents increased with the boiling point.  More olefins were formed at low synthesis temperature, 375°, than at the higher, 425°.  The octane number, motor method, of the primary benzine was about 80 and could be increased about 12 units with 0.08% by vol. of PbEt₄.  By the addition of alkylated isobutane and PbEt₄, the octane number could be increased to approximately 100.