Trifluoromethyl-Substituted Bis(pyrazolyl)methanes as Ligands for Copper and Silver: Synthesis and Spectroscopic and Structural Characterization

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• 作者：Guido Pampaloni ; Riccardo Peloso ; Daniele Belletti ; Claudia Graiff ; Antonio Tiripicchio
• 刊名：Organometallics
• 出版年：2007
• 出版时间：August 13, 2007
• 年：2007
• 卷：26
• 期：17
• 页码：4278 - 4286
• 全文大小：170K
• 年卷期：v.26,no.17(August 13, 2007)
• ISSN：1520-6041

文摘

New fluorinated bis(pyrazolyl)methanes with the general formula RCH(Pz^F)₂ [R = H,Pz^F = 3-(trifluoromethyl)pyrazolyl, 3,5-bis(trifluoromethyl)pyrazolyl; R = Ph, Pz^F = 3,5-bis(trifluoromethyl)pyrazolyl] have been prepared, and their reactivity with copper and silver salts has beenstudied. Copper derivatives Cu[RCH(Pz^F)₂](L)(OTf) [R = H, Pz^F = 3-(trifluoromethyl)pyrazolyl,3,5-bis(trifluoromethyl)pyrazolyl; R = Ph, Pz^F = 3,5-bis(trifluoromethyl)pyrazolyl, L = CO, cyclooctene(coe); R = Ph, Pz^F = 3,5-bis(trifluoromethyl)pyrazolyl, L = coe, 4-vinylanisole (van), and triethylvinylsilane (tevs)] have been isolated by reacting Cu(OTf)(toluene)_0.5 with the bis(pyrazolyl)methaneligand in the presence of olefin or CO. Some of them have been structurally characterized (R = H, Pz^F= 3-(trifluoromethyl)pyrazolyl, 3,5-bis(trifluoromethyl)pyrazolyl, L = CO). These compoundsare monomeric and show strong interactions between copper and one oxygen atom of the triflatemoiety. [Bis[3,5-bis(trifluoromethyl)pyrazolyl]methyl]silver complexes have been prepared fromAgBF₄ and the ligand. The coe derivative [Ag{CH₂(3,5-(CF₃)₂Pz)₂}(coe)]BF₄ has been obtained in goodyields.