Phosphino-Boryl-Naphthalenes:
Geometrically Enforced, Yet Lewis Acid Responsive P → B Interactions
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Abstract
Three
naphthyl-bridged phosphine-borane derivatives <b>2</b>-BCy<sub>2</sub>, <b>2</b>-BMes<sub>2</sub>, and <b>2</b>-BFlu,
differing in the steric and electronic properties of the boryl moiety,
have been prepared and characterized by spectroscopic and crystallographic
means. The presence and magnitude of the P → B interactions
have been assessed experimentally and theoretically. The naphthyl
linker was found to enforce the P → B interaction despite steric
shielding, while retaining enough flexibility to respond to the Lewis
acidity of boron