title: Some reactions of an eta3-tetracyanobutadienyl-ruthenium complex.
abstract: In the eta(3)-butadienyl complex Ru{eta(3)-C(CN)(2)CPhC=C(CN)(2)}(PPh(3))Cp 1, which is formed from Ru(C[triple bond]CPh)(PPh(3))(2)Cp and tcne, a CN group reacts with MeO(-) to give the methoxy-amide Ru{NH=C(OMe)C(CN)=CCPh=C(CN)(2)}(PPh(3))Cp 2, in which the NH has displaced the C=C from the Ru centre with formation of a RuC(3)N ring. "Click addition" of azide to a CN group in 1 gives the oligomeric tetrazolato complex Ru{N(3)N[Na(OEt(2))]=CC(CN)=CCPh=C(CN)(2)}(PPh(3))Cp 3, also containing a RuC(3)N ring. Salt-elimination reactions of 3 with MeOTf, FeCl(dppe)Cp, RuCl(dppe)Cp* and trans-PtCl(2){P(tol)(3)}(2) result in selective substitution at one nitrogen atom of the RuC(3)N ring. Geometries of 1 and the anion in 3 were computed by DFT methods. Preferences for CN groups attacked in the nucleophilic and cycloaddition reactions of 1 are supported by NBO calculations. Alkylation of 1 in reactions with 1,2-dimethoxyethane gave two isomers of Ru{N(3)[CH(CH(2)OMe)(OMe)]N=CC(CN)=CCPh=C(CN)(2)}(PPh(3))Cp 8 and 9, differing in the sites of attachment of the alkyl group, likely by radical processes. The molecular structures of eight complexes are reported, including a re-determination of 1. Computed NMR chemical shifts are used to reassign the butadienyl carbon resonances in the (13)C NMR spectrum of 1.
authors.affiliation: School of Chemistry & Physics, University of Adelaide, Adelaide, South Australia 5005. michael.bruce@adelaide.edu.au
authors.forename: Michael I
authors.initials: MI
authors.lastname: Bruce
authors.forename: Mark A
authors.initials: MA
authors.lastname: Fox
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Low
authors.forename: Brian W
authors.initials: BW
authors.lastname: Skelton
authors.forename: Natasha N
authors.initials: NN
authors.lastname: Zaitseva
mesh_terms: D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D018360:Crystallography, X-Ray; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013816:Thermodynamics
chemical_list: D056831:Coordination Complexes; D009942:Organometallic Compounds; D012428:Ruthenium