Germaborenes: Borylene Transfer Agents for the Synthesis of Iminoboranes

Abstract

Halide and phenyl substituted germaborenes were shown to react with azides at room temperature and transfer a borylene moiety to give iminoboranes. This iminoborane synthesis based on a borylene transfer route was investigated computationally in the case of the phenyl substituted germaborene.

Phosphine-Stabilized Germasilenylidene: Source for a Silicon-Atom Transfer

“…13 Besides the formation of G, phosphine-stabilized germaborenes were also synthesized. 7,14,15 In this publication, we report on the synthesis and reactivity of the phosphine-stabilized germasilenylidene 4 (Scheme 1), a derivative of B.…”

“…61−65 Obviously, stabilization of the low-valent species by the chelating germylene−phosphine is weak enough to allow for transfer of a germanium atom, borylene units, and a silicon atom. 7,14,15 After storage of a benzene solution of 4 at room temperature for several days, the red color of the solution turns a deeper red to give a burgundy-red solid after evaporation of the solvent. Single crystals suitable for X-ray diffraction were obtained from benzene/pentane and are of purple color.…”

“…Müller et al reported recently the synthesis of siladigermirane. , We are currently investigating the chemistry of intramolecular phosphine-stabilized diarylgermylene 1 (Scheme ). Besides the formation of G , phosphine-stabilized germaborenes were also synthesized. ,, In this publication, we report on the synthesis and reactivity of the phosphine-stabilized germasilenylidene 4 (Scheme ), a derivative of B .…”

“…It was previously shown that phosphine-stabilized digermavinylidene and germaborenes can transfer a germanium atom or a borylene unit. , Therefore, we studied the reaction of 4 with diazabutadiene derivatives (Scheme ). At room temperature, diazabutadiene derivatives [R = tert -butyl ( t Bu) and 2,6-diisopropylphenyl (Dipp)] show a slow reaction with 4 .…”

“…With formation of the silylenes 5a and 5b , 4 can be regarded as a source of silicon atoms. The transfer of silicon­(II) was realized using the [Cp*Si] cation. − Obviously, stabilization of the low-valent species by the chelating germylene–phosphine is weak enough to allow for transfer of a germanium atom, borylene units, and a silicon atom. ,, …”