om5010918_si_001.pdf (1.19 MB)
Silanetriols as Powerful Starting Materials for Selective Condensation to Bulky POSS Cages
journal contribution
posted on 2015-12-17, 06:31 authored by Natascha Hurkes, Clemens Bruhn, Ferdinand Belaj, Rudolf PietschnigControlled
condensation reactions of tertiary silanetriols CH3(CH2)n(CH3)2CSi(OH)3 (1b–f; n = 1–5) in the presence of trifluoroacetic
acid and the hydrolysis of CH3(CH2)6(CH3)2CSiCl3 (3) lead
to the selective formation of the corresponding disiloxane tetrols
[CH3(CH2)n(CH3)2CSi(OH)2]2O (2b–g; n = 1–6) in good
yields. The TBAF-driven condensation reactions of the silanetriols
CH3(CH2)n(CH3)2CSi(OH)3 (1a–c; n = 0–2) as well as of the disiloxane-1,1,3,3-tetrol 2d (n = 3) yield in the selective formation
of the first T8 cages bearing tertiary carbon substituents,
CH3(CH2)n(CH3)2C (4a–d; n = 0–3), which was not possible via the condensation
of their alkoxysilane counterparts so far. The resulting compounds 2b–g and 4a–d have been characterized by multinuclear NMR, MS, and single-crystal
X-ray diffraction.
