Adaptability of the SiNN Pincer Ligand in Iridium and Rhodium Complexes Relevant to Borylation Catalysis

A comparison
of Rh and Ir complexes of the SiNN ligand (combining
Si–H, amido, and quinoline donors) reveals its great degree
of adaptability. The amido donor can function as a boryl group acceptor,
and the Si–H/metal interaction is highly variable. In contrast
to Ir analogues, complexes of Rh do not catalyze dehydrogenative borylation
of terminal alkynes but do act as modest benzene borylation catalysts.