Methods for effecting monofunctionalization of (CH2CH)8Si8O12

Abstract

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.