Synthesis and structure of 1,3-bis(hydroxysilyl)-2,4-dimethyl-2,4-diphenylcyclodisilazane

Abstract Trans-silylation reactions of (Me 3 Si) 2 NH with PhRSiCl 2 (R = Me, Ph) gave HN(SiMePhCl) 2 ( 1 ) or ClMePhSiNHSiPh 2 Cl ( 2 ). The treatment of 1,3-dichlorodisilazane ( 1 or 2 ) with an equimolar amount of n -BuLi led to the formation of 1,3-bis(chloro-silyl)-2,4-dimethyl-2,4-diphenylcyclodisilazane (ClSiMePh) 2 (NSiMePh) 2 ( 3 ) or (ClSiPh 2 ) 2 (NSiMePh) 2 ( 4 ), which was allowed to hydrolyze to form 1,3-bis(hydroxysilyl)-2,4-dimethyl-2,4-diphenylcyclodisilazane (HOSiMePh) 2 (NSiMePh) 2 ( 5 ) or (HOSiPh 2 ) 2 (NSiMePh) 2 ( 6 ), respectively. The cyclodisilazane monomers were characterized by elemental analysis, NMR and IR spectroscopy. Compound 3 was obtained as a 4:6 cis / trans mixture while 4 adopted trans -structure considering the hindrance of pendent groups. In addition, the molecular structures of trans - 5 and trans - 6 were determined by X-ray crystallographic analysis and discussed in detail.