Ruthenium triphenylphosphine substitutes

Pyridazines form complexes with iodine, iodine monochloride, bromine, nickel(II) ethyl xanthate, iron carbonyls, iron carbonyl and triphenylphosphine, boron trihalides, silver salts, mercury(I) salts, iridium and ruthenium salts, chromium carbonyl and transition metals, and pentammine complexes of osmium(II) and osmium(III) (79ACS(A)125). Pyridazine N- oxide and its methyl and phenyl substituted derivatives form copper complexes (78TL1979). 

Non-ionic thiourea derivatives have been used as ligands for metal complexes [63,64] as well as anionic thioureas and, in both cases, coordination in metal clusters has also been described [65,66]. Examples of mononuclear complexes of simple alkyl- or aryl-substituted thiourea monoanions, containing N,S-chelating ligands (Scheme 11), have been reported for rhodium(III) [67,68], iridium and many other transition metals, such as chromium(III), technetium(III), rhenium(V), aluminium, ruthenium, osmium, platinum [69] and palladium [70]. Many complexes with N,S-chelating monothioureas were prepared with two triphenylphosphines as substituents. 

As already mentioned earlier, the ruthenium complex [Ru(bdmpza) Cl(PPh3)2l (24) easily releases one of the two phosphine ligands and allows the substitution not only of a chlorido but also of a triphenylphosphine ligand for K -coordinating carboxylato or 2-oxocarboxylato ligands (58). The purpose of these studies was to find structural ruthenium models for the active site of 2-OG dependent iron enzymes, since ruthenium(II) complexes are low spin and thus suitable for NMR characterization, whereas ferrous iron complexes with NJV,0-ligands are often difficult to investigate, due to their... 

Heating I in a nonpolar solvent (e.g., toluene or decalin) in the presence of excess phosphine or phosphite results in the smooth displacement of both triphenylphosphine ligands to give the bis-substituted ruthenium complexes in moderate to high yield [Eq. (9)] (5). This reaction repeated in... 

Butyrolactones.—A simple method for the direct conversion of protected buty-rolactols into the corresponding butyrolactones is by oxidation with m-chloro-peroxybenzoic acid in the presence of a catalytic amount of boron trifluoride etherate. Yields are usually high but, disappointingly, the method fails with 5-lactols. Unsaturated amide (50) can be converted into the substituted buty-rolactone (51) by treatment with phenyl selenenyl chloride. The generality of this reaction remains to be established. 2-Chloro-4-alkylbutyrolactones (52 X = H or Cl) can be formed from di- or tri-chloroacetic acid respectively and alk-l-enes in the presence of dichlorotris(triphenylphosphine)ruthenium(ii). ... 

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