Recent Developments in the Coordination Chemistry of Multidentate Ligands Featuring a Boron Moiety

• Published in: Chemistry, an Asian journal Vol. 8; no. 8; pp. 1720 - 1734
• Main Authors: Kameo, Hajime, Nakazawa, Hiroshi
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.08.2013; WILEY‐VCH Verlag; Wiley Subscription Services, Inc
• Subjects: boranes; Boron; chelates; Chemistry; coordination chemistry; Ligands; multidentate ligands; Peptides; transition metals; boranes; chelates; multidentate ligands; coordination chemistry; transition metals
• ISSN: 1861-4728; 1861-471X
• DOI: 10.1002/asia.201300184

Synergistic effects between a transition metal and an appropriate ligand are required to promote a desired catalytic reaction. Ancillary ligands, provided by the versatile functionality of certain elements, give rise to an almost infinite potential for catalytic applications. Recently, the study of the synergistic effect between transition metals and boron has become easy on account of the development of various rigid multidentate frameworks. In this Review, we mainly focus on the chemistry of σ‐acceptor (Z‐type) borane ligands, particularly the key achievements of their unique reactivity and catalytic applications. Conceptually, the unique character of σ‐acceptor borane ligands provides a new strategy for developing remarkable reactivity and novel catalytic applications. This study discusses recent developments in the field in this context. The chemistry of boron‐based multidentate ligands that involve a covalent MB bond such as the boryl ligand (BR2), in which a boron moiety serves as a strong electron‐donating ligand, is also rapidly developing. The effect of the boryl ligand on a metal center is totally different from that of the borane (BR3) ligand, and different boron‐based functionalities confer opposing electronic properties to the metal center. The interesting character of boryl‐based chelating ligands augments their unique coordination chemistry, which is also summarized in this context. Cooperation and coordination: Recently, the study of the synergistic effect between transition metals and boron has become easier owing to the development of various rigid multidentate frameworks. In this Review, we mainly focus on the chemistry of σ‐acceptor (Z‐type) borane ligands, in particular, the key achievements of their unique reactivity and catalytic applications. The unique coordination chemistry augmented by boryl‐based chelating ligands is also summarized.