Organometallic Chemistry of Palladium and Platinum with Poly(pyrazol-1-yl)alkanes and Poly(pyrazol-1-yl)borates

The poly(pyrazol-1-yl)alkane ligands have been important in the development of the organometallic chemistry of palladium and platinum, and recent new applications have included their role in stabilising organopalladium(IV) compounds and in the synthesis of intramolecular coordination systems containing tripodal [N~C~N]- ligands coordinated to platinum(IV). This review includes these two new areas of poly(pyrazol-1-yl)alkane chemistry, and includes comparisons with earlier organopalladium and organoplatinum chemistry, and related chemistry where appropriate. In addition to poly(pyrazol-1-yl)alkanes and poly(pyrazol-1-yl)borates, closely related polydentate ligands contining at least one pyrazol-1-yl (pz) group are included, in particular, ligands containing the pyridin-2-yl (py) and N-methylimidazol-2-yl (mim) groups.