Synthesis and characterization of new organosilanediols with Si-N bonds

Using 2,6- and 2,4,6-alkyl-substituted sterically hindered primary amines, N-bonded silicon dichlorides RN(SiMe3)(Si(Me)Cl-2) (R = 2,6-Me2C6H3 (1a), R = 2,6-i-Pr-C6H3 (1b) and R = 2,4,6-Me3C6H2 (1c) have been prepared. Contro lled hydrolysis of these dichlorides afforded the N-bonded silanediols RN(S iMe3)(Si(Me)(OH)(2)) (R = 2,6-Me2C6H3 (2a), R = 2,6-i-Pr-C6H3 (2b), and R = 2,4,6-Me3C6H2 (2c). The X-ray crystal structure of 2c has been carried out . The structure of the diol consists of cyclic hydrogen-bonded dimers linke d by further intermolecular hydrogen bonding into a polymeric ribbonlike ar rangement.