Process for the production of O-derivatives of p-isopropenyl phenol

A process for the production of an O-derivative of p-isopropenyl phenol corresponding to the formula ##STR6## in which R.sup.1 represents an aliphatic, cycloaliphatic, araliphatic or aromatic radical which may be substituted;

• a cyano group;
• an organic or inorganic acyl radical or a halogen carbonyl or alkoxy or aroxy carbonyl radical,
• which comprises heating the corresponding O-derivative of dimeric, trimeric, oligomeric or polymeric p-isopropenyl phenol at a temperature of from 60.degree. to 300.degree. C. in the presence of a catalytic amount of an acid catalyst which is inert and non-volatile at the heating temperature and thereby splitting said corresponding O-derivative.