870446-96-1Relevant academic research and scientific papers
Novel hydridoirida-β-diketones containing small molecules, CO, or ethylene: Their behavior in coordinating solvents such as dimethylsulfoxide or acetonitrile
Acha, Francisco,Garralda, Maria A.,Ibarlucea, Lourdes,Pinilla, Elena,Torres, M. Rosario
, p. 9084 - 9091 (2005)
New hydridoirida-β-diketones [lrH{(PPh2(o-C 6H4CO))2H}(CO)]ClO4 2 and [IrH{(PPh2(o-C6H4CO))2H}(olefin)] BF4 (olefin = C2H4,5; 1-hexene, 10) have been prepared. These complexes may afford new diacylhydridoiridium(III) derivatives. In chloroform solution, complex 2 is in equilibrium with the deprotonated diacylhydride trans-[IrH(PPh2(O-C6H4-CO)) 2(CO)] complex 3. In DMSO, deprotonation of 2 occurs to yield the kinetically favored product 3, which isomerizes to the thermodynamically favored complex cis-[IrH(PPh2(o-C6H4CO)) 2(CO)] 4. Reprotonation of 4 with HBF4 in chlorinated solvents gives the cation in 2. In coordinating solvents such as dimethyl sulfoxide or acetonitrile, complex 5 undergoes displacement of ethylene to afford [IrH{(PPh2(o-C6H4CO)) 2H}(L)]BF4 (L = DMSO, 7; CH3CN, 9). Complexes 5 and 7 undergo deprotonation by NEt3 to give the corresponding diacylhydrides. The ethylene complex gives only trans-[IrH(PPh 2(o-C6H4CO))2(C2H 4)] 6, while the dimethyl sulfoxide derivative affords a mixture of trans-and cis-[IrH(PPh2(o-C6H4CO)) 2(DMSO)] 8. Complex 10 shows inhibited alkene rotation around the Ir-olefin axis. All of the complexes were fully characterized spectroscopically. Single-crystal X-ray diffraction analysis was performed on complexes 3, 4, and 9. The 13C NMR and X-ray data point to a carbenoid character in the carbon atoms bonded to iridium in the irida-β-diketone fragment, so that it can be considered as an acyl(hydroxycarbene) moiety.
