Majumdar, Moumita published the artcileMapping the Transformation [{RuII(CO)3Cl2}2] to [RuI2(CO)4]2+: Implications in Binuclear Water-Gas Shift Chemistry, Name: 2,7-Dimethyl-1,8-naphthyridine, the publication is Chemistry – A European Journal (2010), 16(8), 2574-2585, S2574/1-S2574/12, database is CAplus and MEDLINE.
The complete sequence of reactions in the base-promoted reduction of [{RuII(CO)3Cl2}2] to [RuI2(CO)4]2+ has been unraveled. Several μ-OH, μ:κ2-CO2H-bridged diruthenium(II) complexes have been synthesized; they are the direct results of the nucleophilic activation of metal-coordinated carbonyls by hydroxides. The isolated compounds are [Ru2(CO)4(μ:κ2-C,O-CO2H)2(μ-OH)(NPF-Am)2][PF6] (1; NPF-Am=2-amino-5,7-trifluoromethyl-1,8-naphthyridine) and [Ru2(CO)4(μ:κ2-C,O-CO2H)(μ-OH)(NP-Me2)2][BF4]2 (2), secured by the applications of naphthyridine derivatives In the absence of any capping ligand, a tetranuclear complex [Ru4(CO)8(H2O)2(μ3-OH)2(μ:κ2-C,O-CO2H)4][CF3SO3]2 (3) is isolated. The bridging hydroxido ligand in 1 is readily replaced by a π-donor chlorido ligand, which results in [Ru2(CO)4(μ:κ2-C,O-CO2H)2(μ-Cl)(NP-PhOMe)2][BF4] (4). The production of [Ru2(CO)4]2+ has been attributed to the thermally induced decarboxylation of a bis(hydroxycarbonyl)-diruthenium(II) complex to a dihydrido-diruthenium(II) species, followed by dinuclear reductive elimination of mol. hydrogen with the concomitant formation of the RuI-RuI single bond. This work was originally instituted to find a reliable synthetic protocol for the [Ru2(CO)4(CH3CN)6]2+ precursor. It is herein prescribed that at least four equivalent of base, complete removal of chlorido ligands by TlI salts, and heating at reflux in acetonitrile for a period of four hours are the conditions for the optimal conversion. Premature quenching of the reaction resulted in the isolation of a trinuclear RuI2RuII complex [{Ru(NP-Am)2(CO)}{Ru2(NP-Am)2(CO)2(μ-CO)2}(μ3:κ3-C,O,O’-CO2)][BF4]2 (6). These unprecedented diruthenium compounds are the dinuclear congeners of the water-gas shift (WGS) intermediates. The possibility of a dinuclear pathway eliminates the inherent contradiction of pH demands in the WGS catalytic cycle in an alk. medium. A cooperative binuclear elimination could be a viable route for hydrogen production in WGS chem.
Chemistry – A European Journal published new progress about 14903-78-7. 14903-78-7 belongs to naphthyridine, auxiliary class 6.6_Aromatics,Naphthyridines, name is 2,7-Dimethyl-1,8-naphthyridine, and the molecular formula is C10H10N2, Name: 2,7-Dimethyl-1,8-naphthyridine.
Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem