Maleic Anhydride → 5,6-Dimethyl-3a,4,7,7a-tetrahydro-2-benzofuran-1,3-dione

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Reaction Steps

A mixture of 2,3-dimethyl-1,3-butadiene (10 g; 0.122 mol), maleic anhydride (11.9 g; 0.122 mol) and benzene (30 ml) was stirred at room temperature for 10 hours, followed by removal of insoluble materials by filtration. The filtrate was concentrated under reduced pressure to give the objective compound (18.66 g). Yield, 86.6%. M.P., 73°-74° C.

Provenance & Evidence