1 90 1h m ch 2 12 2 26 b 1h m ch 2 40 3h s ch 3 2 70 3 00 4h m ch 2 s 5 13 5 16 1h m cho 7 25 2h d ch 7 74 2h d ch a solution of 46 30 g 0 179 mol 3r toluene sulfonyloxy thiolane in 600 ml acetone under nitrogen was cooled to 0 u00b0 c in a separate flask 61 73 g 0 100 mol potassium peroxymonosulfate 2 khso 5 khso 4 k 2 so 4 was stirred in 500 ml distilled water until clear this was added to the acetone solution at 0 u00b0 c and the mixture allowed to warm to room temperature after 25 minutes 75 ml of 10 w v aqueous sodium sulfite was added the acetone was evaporated 300 ml ethyl acetate added and the aqueous layer was extracted with ethyl acetate 3 u00d7 100 ml the combined extracts were dried mgso 4 and concentrated to dryness to yield 48 57 g of crude product the latter was purified by silica gel chromatography using 10 10 1 ethyl acetate ch 2 cl 2 ch 3 oh as eluant to afford purified title product 34 67 g 71 alpha d 4 26 u00b0 c 3 0 chcl 3 in a flame dried flask under nitrogen 31 67.