peri-Interactions in Naphthalenes, 15: The Concept ofIncipient Bipyramidalization in 8-Dimethylamino-naphth-1-yl Silanes and Phosphonium Cations

摘要

The concept of a gradual transition from tetracoualent to hypercoordinated siliconand phosphorus in 8-dimethylamino-naphth-1-yl silanes and phosphonium cationsis critically examined. Various procedures to quantify partial bipyramidalizationfail to indicate incipient hypercoordination. In particular, deviations from tetrahe-drality in trialkyl-(8-dimethylamino-naphth-1-yl) silanes and tri(alkyl / phenyl)-(8-dimethylamino-naphth-1-yl) phosphonium cations do not reflect weak N -+Si /P bonding. Likewise, the distortions at the P4- center in tri(alkyl I phenyl)-(8-diphenylphosphino-naphth-1-yl) phosphonium cations are not indicative of dativePP+ interactions.