It appears from velocity measurements of the ozonisation of benzene, toluene, m ‐xylene, mesitylene and hexamethylbenzene that the reactivity of these substanees increases in the order mentioned. The order of the reaction could not be determined in the case of benzene, toluene and m ‐xylene. With mesitylene the reaction is apparently quatermolecular and with hexamethylbenzene it is apparently bimolecular. The results of comparative velocity measurements with mixtures of benzene and toluene are not in disagreement with direct velocity measurements.
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Johannes van Dijk (1948) studied this question.
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