Abstract
The present paper deals with the synthesis and full characterization of a series of pyridine-functionalized phosphine complexes of Ru(II), namely, RuCl2(Lnx)(PPh3) (Lnx = R2PCH2(C5H2R′R′′N)), differing in the nature of the substituents on the phosphorus (superscript label n in Lnx defined as n = 1 for R = Ph, n = 2 for R = Cy) and/or on the pyridyl group (superscript label x in Lnx defined as x = a for picolyl, noted pic, and x = b for quinolyl, noted quin) and discloses new aspects of their reactivity with respect to catalysis. The ligands 2-[(diphenylphosphino)methyl]-6-methylpyridine, L1a, 2-[(diphenylphosphino)methyl]quinoline, L1b, 2-[(dicyclohexylphosphino)methyl]-6-methylpyridine, L2a, and 2-[(dicyclohexylphosphino)methyl]quinoline, L2b, were prepared and respectively reacted with RuCl2(PPh3)3 under optimized experimental conditions. In a preliminary test, the reaction of RuCl2(PPh3)3 with L1a using a stoichiometric 1/1 metal/ligand ratio gave three complexes, namely, [RuCl2(PPh3)2]2 (1), [(PPh3)2C...
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