Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto 3-3-138, Sumiyoshi-ku, Osaka 558-8585, Japan.
Chem Asian J. 2013 Aug;8(8):1720-34. doi: 10.1002/asia.201300184. Epub 2013 Jun 4.
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.
协同效应是在过渡金属和适当的配体之间产生的，以促进所需的催化反应。辅助配体由某些元素的多功能性提供，为催化应用带来了几乎无限的潜力。最近，由于各种刚性多齿框架的发展，研究过渡金属和硼之间的协同效应变得容易了。在这篇综述中，我们主要关注σ-受体（Z 型）硼烷配体的化学，特别是它们独特反应性和催化应用的关键成就。从概念上讲，σ-受体硼烷配体的独特性质为开发显著的反应性和新颖的催化应用提供了新的策略。本文在这方面讨论了该领域的最新进展。涉及共价 M-B 键的硼基多齿配体的化学，如硼基（-BR2），其中硼部分作为强电子供体配体，也在迅速发展。硼基配体对金属中心的影响与硼烷（-BR3）配体完全不同，不同的硼基功能赋予金属中心相反的电子性质。基于硼的螯合配体的有趣性质增强了它们独特的配位化学，这也在这方面进行了总结。
