反应详情

Methyl 2,5-dichloro-3,4-dihydroxybenzoate (1.1 g) (about 4.6 mmol) and 2.0 g (8.4 mmol) of dichlorodiphenylmethane are heated together to 150° C. After stirring for 1.5 hours the melt is cooled and the product is crystallized from diethyl ether. There are obtained 1.3 g of methyl 4,7-dichloro-2,2-diphenyl-1,3-benzodioxol-5-carboxylate as white crystals of m.p. 112° C.

1. temperatureis cooled
2. customthe product is crystallized from diethyl ether