[CH:1]1([Si:6]([O:11][CH3:12])([O:9][CH3:10])[O:7][CH3:8])[CH2:5][CH2:4][CH2:3][CH2:2]1.O[CH:14]1C[CH2:17][O:16][CH2:15]1.C[Si](C)(C)Cl>C[O-].[Na+]>[CH:1]1([Si:6]([O:11][CH3:12])([O:7][CH3:8])[O:9][CH:10]2[CH2:14][CH2:15][O:16][CH2:17]2)[CH2:2][CH2:3][CH2:4][CH2:5]1In a 100 ml three-neck flask provided with a magnetic stirrer and a reflux condenser were charged 7.7 g (0.0404 mole) of cyclopentyl trimethoxysilane, 35.7 g (0.405 mole) of 3-hydroxy tetrahydrofurane and 53.0 mg (0.98 m mole) of sodium methoxide, which were then reacted with each other in an oil bath of 80° C. for 2 hours under stirring. After cooled, trimethylchlorosilane was added to neutralize the alkali. Then, 5.37 g (0.0218 mole) of cyclopentyl dimethoxy oxa-3-cyclopentyloxysilane were obtained by vacuum distillation. Its structure was confirmed as in Example 1. The yield was 54%.
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