ml 4 06 mmoles of tbdms triflate at 0 u00b0 c was added the reaction mixture was stirred at room temperature for 30 min the reaction mixture was taken in 20 ml of dichloromethane washed with saturated nahco 3 solution 1 u00d7 20 ml water 2 u00d7 20 ml and brine 1 u00d7 20 ml the non aqueous solvent was finally dried with anhydrous na 2 so 4 and dried in vacuum column chromatographic purification using 60 120 mesh silica gel and 2 ethyl acetate in hexane as eluting solvent mixture of the dried residue afforded a 1 as a white solid 1 01 g 71 yield r f 0 4 in 10 ethyl acetate in hexane 1 h nmr 300 mhz cdcl 3 u03b4 0 19 s 6h si c h 3 2 0 9 s 3h 18 c h 3 1 0 s 9h sic c h 3 3 1 4 1 7 and 1 9 2 55 m 13h cyclopentane and cyclohexane ring protons 2 85 m 2h 6 c h 2 6 52 d j 2 2 hz 1h 4 c h 6 57 dd j1 2 6 hz and j2 8 4 hz 1h 2 c h 7.