1243192-96-2Relevant academic research and scientific papers
Dehydrogenation of hydridoirida-ss-diketones in methanol: The selective formation of mono- and dinuclear acyl complexes
Ciganda, Roberto,Garralda, Maria A.,Ibarlucea, Lourdes,Mendicute, Claudio,Pinilla, Elena,Torres, M. Rosario
, p. 3167 - 3173 (2011/01/06)
The hydridoirida-ss-diketone [IrH((PPh2(O-C 6H4CO))2H)Cl] (1) reacts with diimines (NN) or with pyridine (py) in refluxing methanol to undergo dehydrogenation. The reactions afford selectively the cis-acyl, trans-phosphane isomers of the cationic [Ir(PPh2(o-C6H4CO)) 2(NN)]+ (NN = 2,2′-bipyridine (2); R-N=C(CH 3)-C(CH3)=N-R′ [R = R′ = NH2 (3); R = R′ = OH (4); R = OH, R′ = NH2 (5)]} or neutral [IrCl(PPh2(O-C6H4CO))2(Py)] (6) derivatives. The reactions are faster for ligands containing amino substituents. Refluxing 1 in MeOH affords the formation of an equimolar mixture of dimer cationic species [Ir2(μ-Cl)(μ-PPh2(o-C 6H4CO))2(PPh2(o-C6H 4CO))2]+ (7a and 7b) containing two acyls and a chloride as bridging groups. The isomers could be separated by fractional precipitation. Compound [3]C1, containing amino substituents in the imino functionalities, catalyses the hydrogen transfer from 2-propanol to cyclohexanone to afford cyclohexanol. All the complexes were fully characterised spectroscopically. Single crystal X-ray diffraction analysis was performed on complexes 6 and [7b]ClO4.
