2-Phenylimidazole−PdCl2 and 2-Phenylimidazoline−PdCl2 Complexes: Single-Crystal and Powder X-ray Diffractometry, 1H NMR Spectra, and Comparison of Catalyti

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• 作者：Kenjiro Kawamura ; Satoshi Haneda ; Zhibin Gan ; Kazuo Eda ; Masahiko Hayashi
• 刊名：Organometallics
• 出版年：2008
• 出版时间：August 11, 2008
• 年：2008
• 卷：27
• 期：15
• 页码：3748-3752
• 全文大小：273K
• 年卷期：v.27,no.15(August 11, 2008)
• ISSN：1520-6041

文摘

Single-crystal X-ray diffractometry and powder X-ray diffractometry of the complexes dichlorobis(2-phenyl-1H-imidazole)palladium(II) (1) and dichlorobis(2-phenyl-4,5-dihydro-1H-imidazole)palladium(II) (2) and ¹H NMR structure elucidation in DMF-d₇ solution are discussed. In the case of complex 1, we found that changing the solvent for recrystallization from a mixture of DMF and toluene (method A) to only DMF (method B) afforded complexes 2 and 2′, having crystallographically different structures. ¹H NMR studies indicated that the spectra of the solid samples 2 and 2′ are the same in DMF-d₇. This indicated that the Pd−N bond rotates easily in solution, whereas complexes 2 and 2′ coexist through strong packing in the solid state. The catalytic activities of Pd complexes 1 and 2 in coupling reactions such as the Mizoroki−Heck reaction and Suzuki−Miyaura coupling will also be disclosed.