Synthesis and Characterization of Tungsten Alkylidene and Alkylidyne Complexes Supported by a New Pyrrolide-Centered Trianionic ONO3鈥?/sup> Pincer-Type Ligand

详细信息    查看全文

• 作者：Matthew E. O鈥橰eilly ; Soufiane S. Nadif ; Ion Ghiviriga ; Khalil A. Abboud ; Adam S. Veige
• 刊名：Organometallics
• 出版年：2014
• 出版时间：February 24, 2014
• 年：2014
• 卷：33
• 期：4
• 页码：836-839
• 全文大小：268K
• 年卷期：v.33,no.4(February 24, 2014)
• ISSN：1520-6041

文摘

Synthetic protocols for a pyrrolide-centered ONO^{3鈥?/sup> trianionic pincer-type ligand are presented. Treating (tBuO)₃W鈮tBu with the proligand [pyr-ONO]H₃ (2) results in the formation of the trianionic pincer alkylidene complex [pyr-ONO]W鈺怌HtBu(OtBu) (3). Addition of a mild base to complex 3 provides the trianionic pincer alkylidyne complex {MePPh₃}{[pyr-ONO]W鈮tBu(OtBu)} (4). All new compounds were characterized by NMR spectroscopy, combustion analysis, and, in the case of complex 4, single-crystal X-ray crystallography. DFT calculations performed on 4 provide insight into its electronic structure and indicate that the HOMO is ligand-based and localized on the pyrrolide 蟺 orbitals.}