Silanetriols Preparation and Their Reactions

R. Murugavel, A. Voigt, M. G. Walawalkar, H. W. Roesky, Silanetriols Preparation and Their Reactions, in Organosilicon Chemistry III From Molecules to Materials (N. Auner, J. Weis), VCH, Weinheim, 1998, p. 376. 

Towards this end, we have been recently successful in synthesizing a series of silanetriols with diverse substituents and studying their chemistry in detail. The various sections of this article summarize the following aspects of silanol chemistry (a) various synthetic routes available for the preparation of soluble and stable silanetriols starting from commonly available starting materials, (b) common spectroscopic and structural properties of silanetriols, (c) reactions of silanetriols with various metal precursors leading to the preparation of novel polyhedral metallasiloxanes, (d) structures of metallasiloxanes, and (e) possible applications. 

In fact, these cyclic trimers may be incorporated into silicone resins of the type employed in surface coatings. In such products, a silanetriol is incorporated to cross-link the resin (this cross-linking reaction has been previously described) and to allow the presence of excess hydroxyl groups after resin preparation. These materials containing excess hydroxyl groups are then applied to a substrate as a surface coating and subsequently cured via a thermal cycle of up to 60 min at 500 °F. When catalyzed, their cure cycle may be reduced to 30-60 min at 400 °F. Some typical catalysts and the levels at which they are usually employed are listed in Table II. 

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