2,2',6-Trihydroxy-4'-methoxy-4,6'-dimethylbenzophenone

Preparation

obtained (poor yields) by photo-Fries rearrangement of two esters in ethanol at r.t.,from 3-hydroxy-5-methylphenyl 2-hydroxy-4-methoxy-6-methylbenzoate ? during 80 h (5%) ;from 3-methoxy-5-methylphenyl 2,6-dihydroxy-4-methylbenzoate during 60 ? h (<2%).