A new method is described for effecting selective monofunctionalization of CH2CH)8Si8O12 2: reaction of 2 with triflic acid (TfOH) produces (TfOCH2CH2)(CH2 CH)7Si8O12 3, which reacts with nucleophiles (e.g. H2O or 2-mercaptopyridine) to produce (XCH2CH2)(CH2CH)7Si8O12 (4 X = OH, 5 X = SC5H4N); acylation of 4 with p-O2NC6H4COCl affords (p-O2NC6H4CO2- CH2CH2)(CH2CH)7Si8O12 6; catalytic hydrogenation of 4 affords (HOCH2CH2) Et7Si8O12 7.
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Feher et al. (1999) studied this question.
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