A Monomeric Organolithium Compound Containing a Free Pyramidal Carbanion in Solution and in the Solid State

摘要

Tris(pyrazolyl)hydroborate ligands are undoubtedly among the most important face-capping,six-electron N-donor ligands in coordination chemistry Compared to these anionic species,the isoelectronic,neutral analogues HC(R_x.pz)_3 are considerably less well developed.However,interest in functionalizing the central methine carbon atom is growing,and such changes to the backbone can dramatically influence the solubility of these ligands and their metal complexes Substitution of the methine hydrogen atom is generally accomplished by deprotonation and reaction with a suitable electrophile.Nevertheless,in most cases the interesting organolithium intermediates were not isolated and characterized but were treated in situ to release the desired products. Thus,little information is available on the constitution of such carbanion-containing species.