[168643-26-3] · C8H14BP · (MW 151.90)
(precursor to metal boratabenzenes)
Physical Data: mp 135-139 °C.
Solubility: soluble in chlorinated and ethereal solvents; sparingly soluble in aromatic solvents.
Form Supplied in: white solid.
Handling, Storage, and Precautions: stable to oxygen and moisture as a crystalline solid, but as a precaution should be stored under an inert atmosphere.
Treatment of 1,3-pentadien-1-yl-5-ylidene (trimethylphosphine) boron (‘borabenzene-PMe3’),1 with any of a variety of anionic nucleophiles furnishes B-substituted alkali-metal boratabenzenes (
In certain cases, h6-boratabenzene complexes can be synthesized without the intermediacy of an alkali-metal boratabenzene, simply through treatment of borabenzene-PMe3 with a transition-metal alkyl or amide (
This approach can circumvent a problem (reduction) that sometimes bedevils reactions of alkali-metal boratabenzenes with transition metals. Thus, efforts to generate Cr(III)-boratabenzene adducts through treatment of Cl3Cr(THF)3 with (C5H5B-Ph)Li fail, furnishing Cr(II)-derived products instead. However, reaction of Ph3Cr(THF)3 with borabenzene-PMe3 affords the desired Cr(III)-boratabenzene complex (
Massachusetts Institute of Technology, Cambridge, MA, USA