Preparation of optically active n-butyl(methyl)phenyl-, tert-butyl(methyl)phenyl- and isopropyl(methyl)phenylsilanes from the corresponding silyl chlorides using 2,2 '-dihydroxy-1,1 '-binaphthyls as resolving agents

Enantiomeric silanes 4a, 4b and 4c were obtained from the corresponding rac emic silyl chlorides via diastereomeric derivatives with (R)-[1,1']binaphth alenyl-2,2'-diol; the optical purity of silanes 4a and 4c was determined (> 98% ee) by HPLC using a chiral cyclodextrin-based column.