Reaction of a boryl anion with silicon halides and alkoxysilanes: Synthesis of borylsilanes

Publication date: Available online 23 November 2019Source: Journal of Organometallic ChemistryAuthor(s): Zhaocai Liu, Chunming CuiAbstractThe reactions of boryl anion [(CH)2(NDipp)2]BLi (Dipp = 2,6-iPr2C6H3) (1) with a series of silicon halides and alkoxysilanes were investigated. Treatment of 1 with SiCl4 and PhSiCl3 afforded corresponding borylsilanes [(CH)2(NDipp)2]BSiCl3 (2) and [(CH)2(NDipp)2]BSiPhCl2 (3), respectively, in good yields. Reaction of HSiCl3 with 1 yielded a mixture of [(CH)2(NDipp)2]BSiHCl2 (4) and [(CH)2(NDipp)2]BH whereas the similar reaction with PhSiHCl2 yielded the borylsilane [(CH)2(NDipp)2]BSiPhHCl (5) as a sole product. In contrast, reaction of 1 with SiBr4 led to the reduction of SiBr4 with the formation of [(CH)2(NDipp)2]BBr and the expected substituted product [(CH)2(NDipp)2]BSiBr3 (6) was not formed. Reaction of alkoxysilane RSi(OMe)3 (R = H, Ph, Np, OMe) with 1 exclusively yielded the substituted product [(CH)2(NDipp)2]BSiR(OMe)2 (7a-d), which reacted with BBr3 to give the bromides [(CH)2(NDipp)2]BSiRBr2 (8a-c, R = H, Ph, Np) and [(CH)2(NDipp)2]BSiBr3 (6, R = OMe). These products have been characterized spectroscopically as well as X-ray single-crystal analysis in some cases.Graphical abstract

Source: Journal of Organometallic Chemistry - November 24, 2019 Category: Chemistry Source Type: research