Abstract
The /sup 38/Cl-for-Cl or -H substitution following the /sup 37/Cl(n,..gamma..)/sup 38/Cl nuclear reaction was studied in neat liquid dichlorobenzene isomers with and without I/sub 2/ present as radical scavenger as well as in highly diluted mixtures of these compounds with a variety of organic solvents, such as simple aliphatic hydrocarbons, aromatics, and perfluorinated aliphatics and aromatics. The results obtained in these systems suggest an interaction between the molecules making up the solvent cage with the intermediates forming the substituted product. This interaction consists most likely of a H abstraction by the Cl radical in the solvent cage, which competes with the reactions of thermal Cl leading to the /sup 38/Cl-substitution products, resulting in reduced yields of the latter compound. In the cases of unreactive wall molecules, e.g., perfluorinated hydrocarbons, such a reaction cannot take place, and the yields of the /sup 38/Cl-substitution products remain large. When the hot /sup 38/Cl-for-Cl substitution in solid dichlorobenzenes present in different crystal forms was studied, no effect of the crystal structure on the substitution process was observed.
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