1. Upon completion of the reaction as judged by TLC, (toluene/EtOAc, 1:1) the mixture was diluted with dichloromethane (10 mL) and filtered through a bed of silica gel. The filtrate was washed with water (10 mL), brine and the combined extracts were dried over Na 2 SO 4 . Removal of the drying agent by filtration followed by concentration of the filtrate under reduced pressure afforded the crude material as an off-white solid. The crude product was triturated with hexane/dichloromethane followed by decantation of the excess solvent from the product;After drying under high vacuum
2. Upon completion of the reaction the mixture was diluted with water (20 mL), extracted with dichloromethane (3 x 20 mL) and the organic extracts were dried over anhydrous sodium sulfate. Removal of the drying agent by filtration followed by concentration of the filtrate under reduced pressure gave a crude product which was submitted to gravitycolumn chromatography;The cyclohexenylmethyl imide
3. Protective Groups in Organic Synthesis