[CH3:1][S:2](Cl)(=[O:4])=[O:3].[Cl:6][C:7]1[CH:23]=[CH:22][C:10]([CH2:11][CH:12]2[CH2:16][CH2:15][C:14]([CH3:18])([CH3:17])[C:13]2([OH:21])[CH2:19][OH:20])=[CH:9][CH:8]=1.C(N(CC)CC)C>ClCCl>[Cl:6][C:7]1[CH:8]=[CH:9][C:10]([CH2:11][CH:12]2[CH2:16][CH2:15][C:14]([CH3:17])([CH3:18])[C:13]2([OH:21])[CH2:19][O:20][S:2]([CH3:1])(=[O:4])=[O:3])=[CH:22][CH:23]=12.76 g (1.05 equivalents) methylsulphonyl chloride were added to a solution of 6.42 g (24 mmols) 1-(4-chlorobenzyl)-3,3-dimethyl-2-hydroxy-2-hydroxymethylcyclopentane prepared as described in Example 1 (i) and 2.55 g (1.1 equivalents) triethylamine in 50 ml dichloromethane at 10°-15° C. The reaction mixture was kept at 10°-15° C. for further 2 hours and then washed with 20 ml water, then 20 ml aqueous sodium bicarbonate solution, dried over anhydrous magnesium sulphate and flashed. Trituration with 60/80 petroleum gave 6.64 g 1-(4-chlorobenzyl)-3,3-dimethyl-2-hydroxy-2-methylsulphonyloxymethylcyclopentane (Isomer A) as a white solid, m.pt. 113°-114° C. Yield: 80%.
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