Perfluorinated Dialkoxysilanediols Resisting Self-Condensation

The reaction of sodium salts of perfluorinated tertiary alcohols R3COH with SiCl4 provided the di-substituted dichlorosilanes (R3CO)(2)SiCl2 (1 a, R=CF3; 1 b, R=C6F5), the hydrolysis of which produced the corresponding silanediols (R3CO)(2)Si(OH)(2) (2 a, R=CF3; 2 b, R=C6F5). Unlike most other dialkoxysilanediols known in the literature, 2 a and 2 b are stable towards self-condensation at ambient conditions. In a similar way, the related disiloxanes [(R3CO)(2)SiCl](2)O (3 a, R=CF3) and [(R3CO)(2)Si(OH)](2)O (4 a, R=CF3) were prepared.