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When tert.-butoxy radicals react with mixed hydrocarbons, alkyl aromatic hydrocarbons are consumed more rapidly in mixtures with saturated hydrocarbons than would be expected from a knowledge of the reactivities of the components. This is due to a hydrogentransfer reaction, in which radicals from the saturated hydrocarbon attack the alkyl aromatic hydrocarbon. In experiments with deuterated toluene, it was found that methyl radicals abstract hydrogen from, and add to, the benzene ring as well as abstract hydrogen (deuterium) from the methyl group. These reactions render measurements of isotope rate factors difficult.

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To demonstrate the utility of the azoarylamine indicators for studying acid-base neutralization reactions in benzene solution, the reaction of trichloroacetic acid with aliphatic amines in benzene was studied by infra-red spectroscopy and indicator techniques. The amines (and the indicators) form complexes of stoichiometry B . HA, B .2HA and B . 3HA, and order-of-magnitude estimates for the formation constants of the B .2HA and B -3HA complexes are reported. It was confirmed that trichloroacetic acid is essentially monomeric in dilute benzene solution but, owing to the formation of acid-salt complexes, the indicator bases react with the acid in accordance with the expression, log bH+]/p] QI n log [HA], where n is rarely integral. This, however, proves to be no severe limitation to their use. The hydrogen bond donors, N,N-dimethylacetamide and trioctylphosphine oxide, also were shown by indicator methods to give acid complexes with trichloroacetic acid.