420a.    CADY, W. E., LAUNER, P. J. AND WEITKAMP, A. W.  Products of the Hydrogenation of Carbon Monoxide Over an Iron Catalyst.  Aromatic Hydrocarbons.  Am. Chem. Soc., 121^st Meeting Abs., March-April, 1952, p. 10-M.

                    Aromatics constitute about 6 wt. % of the hydrocarbons obtained in the hydrocarbon-synthesis process.  They were separated by adsorption on silica gel and by distillation and were analyzed by ultraviolet and infrared spectroscopy.  Benzene is present in traces, but successive C-number fractions contain increasing concentrations of aromatics.  Monocyclic, cicyclic, and tricyclic aromatics occur in proportions that decrease with the number of aromatic rings.  Some of the aromatic hydrocarbons contain a nonaromatic ring fused with the nucleus.  Olefinic unsaturation is an important feature of the high-molecular-weight aromatics.  Some unsaturation may be in the rings of compounds of the indene or the dihydronaphthalene series; the remainder is side-chain unsaturation.  Aromatic rings occur to a small extent in the structures of the oxygenated compounds.  In the benzene series, monoalkyl and o-dialkyl isomers predominate.  A regular pattern of alkylbenzeneisomer distribution suggests a way in which the rings may have been formed.