2,3-Dimethyl-1,3-butadiene → dimethyl (1R,2R)-4,5-dimethyl-4-cyclohexene-1,2-dicarboxylate

Participants

Reaction Steps

2,3-dimethylbutadiene (9.84 g, 0.12mol) and dimethyl fumarate (14.4 g, 0.1 mol) were stirred together in toluene (40 ml) at 50° C. for 24 hr. The solvent was removed in vacuo and the solid residue recrystallised from diethyl ether, to give the title compound in 85% yield. N.m.r: δH (90 MHz, CD3OD) 3.71 (s,6H), 2.55 (m,2H), 2.10 (m,4H), 1.74 ppm (s,6H).

Provenance & Evidence