Abstract
Reduction of RuQ 3 ( 1a, Q = 8-quinolinolato) with Zn/Hg in the presence of various π-acceptor ligands in ethanol affords RuQ 2L 2 (L 2 = (dimethylsulfoxide) 2 ( 2); (4-picoline) 2 ( 3); N, N′-dimethyl-1,4-diazabuta-1,3-diene, dab ( 4); cyclooctadiene, COD ( 5); norborna-2,5-diene, nbd ( 6)). Compound 6 is isolated as an equimolar mixture of cis, trans ( 6a) and trans, cis ( 6b) isomers, which can be separated by column chromatography. DFT calculations have been performed on 6a and 6b. Oxidation of 3 and 6b affords the corresponding ruthenium(III) species 7 and 8, respectively. The structures of 2, 3, 4 and 6 have been determined by X-ray crystallography.
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