Reactivity study of arene(azido)ruthenium N¡ÉO-base complexes with activated alkynes

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• 作者：Saphidabha L.  ; Nongbri^a ; Bruno  ; Therrien^b ; Kollipara Mohan  ; Rao^a ;   ; ^{mohanrao59@gmail.com}
• 关键词：Pyrazine-2-carboxylic acid ; 8-Hydroxyquinoline ; Ruthenium ; Triazole ; Acetylenedicarboxylates ; Arene ligand
• 刊名：Inorganica Chimica Acta
• 出版年：2011
• 出版时间：1 October 2011
• 年：2011
• 卷：376
• 期：1
• 页码：428-436
• 全文大小：780 K

文摘

Substitution reaction of chloro ¦Ç⁶-arene ruthenium N¡ÉO-base complexes [(¦Ç⁶-arene)Ru(N¡ÉO)Cl] [N¡ÉO = pyrazine-2-carboxylic acid (pca-H), 8-hydroxyquinoline (hq-H); arene = p-ⁱPrC₆H₄Me, N¡ÉO = hq (1); arene = C₆Me₆, N¡ÉO = hq (2)] with NaN₃ yield the neutral arene ruthenium azido complexes of the general formula [(¦Ç⁶-arene)Ru(N¡ÉO)N₃] [N¡ÉO = pca, arene = p-ⁱPrC₆H₄Me (3), arene = C₆Me₆ (4); N¡ÉO = hq, arene = p-ⁱPrC₆H₄Me (5), arene = C₆Me₆ (6)]. These complexes undergo [3 + 2] dipolar cycloaddition reaction with activated alkynes dimethyl and diethyl acetylenedicarboxylates to yield the arene triazole complexes [(¦Ç⁶-arene)Ru(N¡ÉO){N₃C₂(CO₂R)₂}] [N¡ÉO = pca, R = Me, arene = p-ⁱPrC₆H₄Me (7), C₆Me₆ (8); R = Et, arene = p-ⁱPrC₆H₄Me (9), C₆Me₆ (10); N¡ÉO = hq, R = Me, arene = p-ⁱPrC₆H₄Me (11) C₆Me₆ (12); R = Et, arene = p-ⁱPrC₆H₄Me (13), C₆Me₆ (14)]. On the bases of proton NMR study, in the above triazole complexes N(2) isomers are assigned with dimethylacetylenedicarboxylate whereas N(1) isomers with diethylacetylenedicarboxylate. All complexes have been characterized by IR and NMR spectroscopy as well as by elemental analysis. The molecular structures of the azido complexes [(¦Ç⁶-p-ⁱPrC₆H₄Me)Ru(pca)N₃] (3), [(¦Ç⁶-p-ⁱPrC₆H₄Me)Ru(hq)N₃] (5) and [(¦Ç⁶-C₆Me₆)Ru(hq)N₃] (6) have been established by single crystal X-ray diffraction studies.