Iridium-carbon

Iridium-carbon multiple bonds allenylidene complexes, 7, 355 carbene complexes, 7, 344 carbyne complexes, 7, 361 higher cumulenylidene complexes, 7, 358 vinylidene complexes, 7, 352 Iridium-carbon single-bonded complexes alkenyl complexes, 7, 319 alkyl and aryl complexes, 7, 303 in C-C bond-forming catalysis, 7, 335 characteristics, 7, 303... 

Colloidal osmium readily undergoes oxidation it catalvtieally assists the oxidation of unsaturated compounds by gaseous hydrogen. In this respect it is stated to be even more effective than the finely divided metal, but less active than either platinum or iridium. Carbon monoxide combines with oxygen, yielding the dioxide, when shaken at ordinary temperatures with the hydrosol of osmium.7... 

Scheme 8.28 A series of iridium(I) complexes containing iridium-carbon double bonds ( the Wurzburg collection ), with the names of the coworkers and the year in which the result was published...

This chapter will not deal with iridium complexes in which the coordination chemistry of the iridium-carbon bond is implicated inasmuch as Leigh and Richards have very recently (1982) provided an excellent detailed review on such compounds organoiridium2 and iridium carbonyl3 complexes were also previously reviewed. Iridium complex chemistry has been reviewed (1980) along with rhodium,4 and in annual reviews.3 Additionally, iridium complexes have been treated in Comprehensive Inorganic Chemistry .6... 

In 1970 two conflicting reports on the stereochemistry of the addition of chiral alkyl halides to square-planar iridium(I) complexes appeared. In one report it was claimed that the reaction of /ra/w-[IrCI(CO)(PPh2Me)2] with optically active CHjCHBrCOjEt occurred with retention of configuration as shown in Scheme 5 (Pearson and Muir, 1970). This result is consistent with a six-coordinate intermediate , as is the lack of incorporation of any free halide into the product (Section 8). However, the conclusions should again be treated with care since the study employs the cleavage of the iridium-carbon bond by halogen, and without knowing the stereochemistry of this reaction little can be said about the stereochemistry of the displacement. 

Reductive H2O2 detection at nanoparticle iridium/carbon film electrode and its application as L-glutamate enzyme sensor. Electroanalysis, 16, 54-59. 

Iridium.—Examples of iridium-carbon bond formation resulting from intramolecular oxidative addition reactions of phosphine or phosphite complexes are discussed in Chapter 6 of this Part. 

Intramolecular Oxidative Addition. This type of oxidative addition is commonly encountered with phosphine and phosphite complexes of iridium(i). It involves insertion of the iridium into a phenyl-carbon-hydro-gen bond, resulting in iridium-carbon bond formation ... 

A recent example of this type of orthometallation is provided by the second stage of the reaction of IrCl(cyclo-octene) with triphenylphos-phite. Some iridium(i)-phosphite complexes react to form not just one but two or three iridium-carbon bonds per molecule. The reaction sequence then involves hydrogen elimination between intramolecular oxidative additions ... 

The UV-visible absorption and emission spectra of the triflate cations [Ir(L)2(S)2], where L is 2-phenylpyridine or 2-(p-tolyl)pyridine, and S is water or acetmiitrile, have been reported. The p)nidine ligands are o/tho-metallated providing six coordinate iridium cenues. The neutral tiis-chelates have been studied by other workers. [IrR(CO)(PAr3)2(maleonitriledithiolate)l complexes luminesce in solution between 695 - 780 nm. Photolysis studies suggest iridium - carbon bond homolysis the crystal structure of the bis(triphenylphosphine) complex where R is methyl was also... 

Iridium Complexes in C-C Bond-forming Catalysis 7.04.4 Iridium-Carbon Multiple Bonds... 

Iridium-Carbon Multiple Bonds 7.04.4.1 Carbene Complexes, lr=CRR ... 

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