Synthesis of conjugated diene complexes of ruthenium(0) derived from Ru(畏⁶-naphthalene)(畏⁴-1,5-COD): Z to E isomerisation of coordinated 1,3-pentadiene

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• 作者：Masafumi Hirano ; ^{hrc@cc.tuat.ac.jp} ; Yumiko Sakate ; Haruka Inoue ; Yasutomo Arai ; Nobuyuki Komine ; Sanshiro Komiya ; Xian-qi Wang¹ ; Martin A. Bennett ; ¹ ; ^{bennett@rsc.anu.edu}
• 关键词：Ruthenium(0) ; Conjugated diene ; 1 ; 3-Pentadiene ; E/Z isomerisation
• 刊名：Journal of Organometallic Chemistry
• 出版年：2012
• 期刊代码：64_0022328x
• 类别：ch
• 出版时间：15 June, 2012
• 卷：708-709
• 期：Complete
• 页码：46-57
• 文件大小：971 K

摘要

The naphthalene complex of zerovalent ruthenium, [Ru(畏⁶-C₁₀H₈)(畏⁴-1,5-COD)] (1), readily reacts with 1,3-dienes in the presence of a ligand (L) to produce complexes [Ru(畏⁴-cisoid-1,3-diene)(畏⁴-1,5-COD)(L)] [1,3-diene聽=聽butadiene, 2,3-dimethylbutadiene, isoprene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 1,3-cyclohexadiene; L聽=聽MeCN, ^tBuCN, PhCN, NCC₆H₄CN, CO, ^tBuNC, pyridine, P(OMe)₃, P(OPh)₃, PMe₃, PEt₃, PPh₃, PCy₃]. The single-crystal X-ray structures of [Ru(畏⁴-cisoid-1,3-butadiene)(畏⁴-1,5-COD)(MeCN)] (2a) and [Ru{畏⁴-(E)-cisoid-1.3-pentadiene}(畏⁴-1,5-COD)(PPh₃)}] (E-5l) show the expected, approximately square pyramidal geometry about the metal atom, with the auxiliary ligand occupying the axial site. [Ru{畏⁴-(Z)-cisoid-1,3-pentadiene}(畏⁴-1,5-COD)(PPh₃)] (Z-5l) irreversibly isomerises to E-5l in benzene-d₆ at 30聽掳C, the reaction obeying a first-order rate law [k聽= (2.89聽卤聽0.06)聽脳聽10^鈭?聽s^鈭?]. This reaction is significantly retarded by addition of PPh₃ suggesting that a vacant site is required for the E/Z isomerisation.