[Si:1](Cl)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[CH2:9]([OH:12])[CH2:10][OH:11].C(N(CC)CC)C>ClCCl.CN(C)C1C=CN=CC=1>[Si:1]([O:11][CH2:10][CH2:9][OH:12])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]tert-Butyldimethylsilylchloride (100 g, 0.66M) in dry dichloromethane (70 ml) was added, drop-wise, to a stirred mixture of distilled ethylene glycol (205.6 g, 3.31M), dry dichloromethane (200 ml), triethylamine (120 ml, 0.86M) and 4-dimethylaminopyridine (8 g, 0.066M) at 0° C. under a nitrogen atmosphere. After the addition the mixture was allowed to warm to ambient temperature and was stirred for a further 3 hours. The mixture was then filtered and the filtrate washed with dilute sodium bicarbonate solution, brine, dried over magnesium sulphate, filtered and then evaporated in vacuo to give a pale yellow oil.
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