1293398-13-6Relevant articles and documents
New highly stable metallabenzenes via nucleophilic aromatic substitution reaction
Lin, Ran,Zhang, Hong,Li, Shunhua,Wang, Jiani,Xia, Haiping
, p. 4223 - 4231 (2011)
Treatment of the ruthenabenzene [Ru{CHC(PPh3)CHC(PPh 3)CH}Cl2(PPh3)2]Cl (1) with excess 8-hydroxyquinoline in the presence of CH3COONa under air atmosphere produced the SNAr product [(C9H6NO) Ru{CHC(PPh3)CHC(PPh3)C}(C9H6NO) (PPh3)]Cl2 (3). Ruthenabenzene 3 could be stable in the solution of weak alkali or weak acid. However, reaction of 3 with NaOH afforded a 7:1 mixture of ruthenabenzenes [(C9H6NO)Ru{CHC(PPh 3)CHCHC}(C9H6NO)(PPh3)]Cl (4) and [(C9H6NO)Ru{CHCHCHC(PPh3)C}(C9H 6NO)(PPh3)]Cl (5), presumably involving a P-C bond cleavage of the metallacycle. Complex 3 was also reactive to HCl, which results in a transformation of 3 to ruthenabenzene [Ru{CHC(PPh3)CHC(PPh 3)C}Cl2(C9H6NO)(PPh3)]Cl (6) in high yield. Thermal stability tests showed that ruthenabenzenes 4, 5, and 6 have remarkable thermal stability both in solid state and in solution under air atmosphere. Ruthenabenzenes 4 and 5 were found to be fluorescent in common solvents and have spectral behaviors comparable to those organic multicyclic compounds containing large π-extended systems. Copyright