3,6-Dimethyl-5,6-dihydro-1-benzofuran-2(4H)-one → 3,6-Dimethyl-1-benzofuran-2(3H)-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 1000 g of 5,6-dihydro-3,6-dimethyl-2(4H)-benzofuranone, 2000 ml of dibutyl maleate and 50 g of palladium-on-charcoal, 5% by weight, was heated for approx. 3 hours at 170° C. in an autoclave under autogenous pressure. After filtration, the product was purified by fractionating on an 80 cm packed column. Approx. 735 g of pure 3,6-dimethyl-2(3H)-benzofuranone were obtained at a b.p. of approx. 90° C. at 1 mbar.

Provenance & Evidence