Dimerisation of unsubstituted allylbenzene ( I ) is not described in the literature. The preparation of I was discussed in a previous communication 1).The dimerisation of p-methoxyallylbenzene (V) under the influence of 43 % sulphuric acid is described, however, and there are produced metanethole ('VI) and probably also isoanethole (VII) as well as a hydrated dimer having structure VIII 2 ) .
CH, <>, -CH