CC(C[AlH]CC(C)C)C.[CH3:10][C:11]1[CH2:12][C:13]([C:22](OC)=[O:23])=[C:14]([C:18](OC)=[O:19])[CH2:15][C:16]=1[CH3:17].CO>ClCCl>[OH:19][CH2:18][C:14]1[CH2:15][C:16]([CH3:17])=[C:11]([CH3:10])[CH2:12][C:13]=1[CH2:22][OH:23]To a solution of DIBAL in dichloromethane (1.0M, 45 ml, 0.045 mol) cooled to ice bath temperature under nitrogen was added dimethyl 4,5-dimethylcyclohexa-1,4-diene-1,2-dicarboxylate (2.24 g, 0.01 mol) in dry dichloromethane (30 ml) over 30 min. The resultant solution was stirred for a further 60 mins at this temperature after which methanol (10 ml) was added. The mixture was allowed to come to room temperature, filtered through a "Celite" pad, and the filtrate concentrated in vacuo to give an oil. Crystallisation from ethyl acetate/petroleum ether (40°-60° C.) gave the title compound in 35% yield. N.m.r: δH (90MHz, CD3OD) 4.15 (s,4H), 3.55 (bs,2H), 2.82 (s,4H), 1.69 ppm (s,6H)
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