GAS-CHROMATOGRAPHIC IDENTIFICATION OF PHENYLALKANES AND BICYCLIC HYDROCARBONS.
Abstract Retention indices and their temperature coefficients have been measured with Silicone Oil DC 710 and Emulphor O as liquid phases. Some experimental rules are put forward.
Steric Effects in the Gas – Liquid Chromatography of some Alkylbiphenyls
RECENT ultra-violet spectroscopic studies of the effects of substitution on the biphenyl chromophore led to the preparation of a number of alkyl-substituted biphenyls, and the purity of these compounds and of others prepared elsewhere were checked by the use of the gas – liquid chromatographic apparatus available in this Institute. It was immediately apparent that the considerable changes in the ultraviolet absorption spectra which accompany substitution in the ortho positions of the biphenyl system1 were closely paralleled by correspondingly large changes in the relative retention volumes of the compounds.
Radiation protection in cyclohexane.
Protection of a substance against certain modes of radiolysis by introduction of a low-concentration solute which can interfere with the normal fate of some primary intermediate can be achieved by a variety of mechanisms (1). The system most extensively studied in this connection is cyclohexane + benzene. Reduction of the yield of hydrogen and ethylene by addition of small amounts of benzene to cyclohexane is not adequately explained solely on the basis of a scavenging process in which benzene intercepts H atoms (2, 3). An alternative suggested mechanism of such observed protection is energy transfer (via either charge or virtual photon) from cyclohexane to the more stable benzene. This paper describes and interprets results of additional studies of the effects of iodine and other additives on the yield of hydrogen from the cyclohexane + benzene system. Similar experiments by Schuler (4) have recently been reported.