Die γ-Radiolyse des flüssigen Chlorbenzols
| Autor: | J. Wendenburg, A. Henglein |
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| Rok vydání: | 1962 |
| Předmět: | |
| Zdroj: | Zeitschrift für Naturforschung B. 17:590-597 |
| ISSN: | 1865-7117 0932-0776 |
| Popis: | Chlorobenzene is decomposed by Co-60 γ-radiation with a total yield of 7.0 + 0.5 molecules per 100 eV. This yield decreases with increasing dose. 50% conversion is observed at a dose of 109 rads. At least 25% of the molecules consumed are converted by a molecular mechanism which cannot be inhibited by iodine. Primary radical formation by the dissociation C6H5Cl → C6H5·+ Cl· occurs with G = 1.8. At an average, each of the generated radicals and atoms attacks one intact molecule of chlorobenzene to form benzene (G = 2.4), hydrogen chloride (G = 1.4) and some secondary free radicals. These combine or disproportionate to give the isomers of dichlorobenzene (G = 0.23). dichlorodiphenyl and chlorodiphenyl (G = 1.0). One of their main products is a tetramer (G = 1.5 base units/100 eV) which could be separated by precipitation with methanol. It contains 1.28 chlorine atoms per C6-ring and several olefine double bonds when formed at low doses. At higher doses its chlorine contents increases up to 1.9 atoms/C6-ring since the double bonds are able to add the hydrogen chloride formed. The isomers of chlorodiphenyl are formed in the abundance ratio which is expected from statistical considerations of free phenyl radical addition to chlorobenzene. The isomers of dichlorobenzene are formed in a ratio which is between that of the statistical distribution and that known from the chlorination of chlorobenzene in the presence of AICl3. |
| Databáze: | OpenAIRE |
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