General Procedure F. To a N2 flushed flask containing a solution of triethylene or diethylene glycol (5.25 eq.) in DCM (0.5 mL/mmol), was added DIPEA (1.1 eq.). MEMCl or MOMBr (1.0 eq.) were then added dropwise, and the reaction was left to stir at r.t. for 16 h. The mixture was then diluted with DCM ( mL) and water (20 mL), and the organic layer separated. The aqueous phase was extracted with DCM (3 × 20 mL), and the combined organic layers were dried with MgSO4 and concentrated in vacuo. The residue was then purified by flash column chromatography to yield mono-MEM/MOM protected alcohols as colourless oils.