Dimethyl gold complex

AsFe04C 2H]5, Iron, tetracarbonyl-(triphenylarsine)-, 26 61 As2C Hu, Arsine, 1,2-phenylenebis-(dimethyl)-gold complex, 26 89 As4Au2F,( C,2H1 , Gold(I), bis[ 1,2-... 

Similar fluxional behavior has been observed for dimethyl gold complexes of 2,7-dimethyl-1,8-naphthyridine.110 In methylene chloride or chloroform the intermolecular exchange is rapid on the NMR time scale at ambient temperatures, whereas below 200 K, the exchange is sufficiently slow to give two different sets of proton signals. Thus, the equilibrium that exists can be described by the following equation ... 

Fig. 19.4 IR spectrum of a MgO-supported mononuclear dimethyl gold complex, along with the spectra of several reference compounds in the C-H stretching region. Reprinted with permission from [29]. Copyright 2005 American Chemical Society...

Guzman J, Anderson BG, Vinod CP, Ramesh K, Niemantsverdriet JW, Gates BC (2005) Synthesis and reactivity of dimethyl gold complexes supported on MgO Characterization by infrared and X-ray absorption spectroscopies. Langmuir 21 3675... 

C10H15N, Benzenemethanamine, N,N,4-trimethyl-, lithium complex, 26 152 C10H15P, Phosphine, diethylphenyl-, nickel complex, 28 101 platinum complex, 28 135 CioHigAsi, Arsine, 1,2-phenylenebis(dimethyl-, gold complex, 26 89 nickel complex, 28 103 CioHie, 1,3-Cyclopentadiene, 1,2,3,4,5-pen-tamethyl-, 28 317 chromium complex, 27 69 cobalt complexes, 28 273, 275 iridium complex, 27 19 samarium complex, 27 155 titanium complex, 27 62 ytterbium complex, 27 148 CioH,gBrN04S, Bicyclo[2.2.1]heptane-7-methanesulfonate, 3-bromo-1,7-di-methyl-2-oxo-, U.IRHENDO, ANTPi]-, ammonium, 26 24... 

The approach comprises deposition-precipitation (DP) of Au(OH)3 onto the hydroxide surfaces of metal oxide supports from an alkaline solution of HAUCI4 [26] and grafting of organo gold complexes such as dimethyl gold (Ill)acetylacetonate (hereafter denoted as Au acac complex) [27] and Au(PPh3)(N03) [28] either in gas and liquid phase are advantageous in that a variety of metal oxides commercially available in the forms of powder, sphere, honeycomb can be used as supports. 

CsHuN, Ethanamine, A-ethyl-A-methyl-tungsten complex, 26 40, 42 C6HF5, Benzene, pentafluoro-gold complexes, 26 86-90 C H4I2, Benzene, 1,2-diido-iridium complex, 26 125 CJT, Phenyl platinum complex, 26 136 C,H,N, Pyridine osmium complex, 26 291 OHtS, Benzenethiol osmium complex, 26 304 QH7P, Phosphine, phenyl-cobalt-iron complex, 26 353 QH 1-Butyne, 3,3-dimethyl-mercury-molybdenum-ruthenium complex, 26 329-335 C6H 4P, Phosphine, triethyl-platinum complex, 26 126 platinum complexes, 26 135-140 CsHisPO, Triethyl phosphite iron complex, 26 61... 

Figure 8.8 shows a series of infrared spectra obtained in DRIFTS mode of an organometallic gold complex, dimethyl gold acetyl acetonate, Au(CH3)2(CsH702)... 

CsHiuOj, Propanoic acid, 2,2-dimethyl-, tungsten complex, 26 223 C,H 2, Propane, 2,2-dimcthyl-, magnesium and tungsten complexes, 26 46, 47, 50 C,Hi,N, Ethanamine, IV-ethyl-yV-methyl-, tungsten complex, 26 40, 42 QHF5, Benzene, pentafluoro-, gold complexes, 26 86-90... 

A related group of compounds is that of the gold(III) dimethyl(alkoxycarbonyl) complexes, accessible by the reaction of carbon monoxide with dimethyl(alkoxy)(triphenyl-phosphine)gold(III), which is prepared in situ from cw-[AuIMe2(PPli3)] and sodium alkoxide in methanol (equation 80)353,359. Thermolysis of the methoxycarbonyl complex in benzene leads to the reductive elimination of methyl acetate and ethane, indicating competition between the two modes of decomposition illustrated in Scheme 27. The reaction of the same complex with electrophiles such as hydrogen chloride proceeds with liberation of carbon monoxide and methanol, as illustrated in equation 81. 

A major hurdle towards understanding the unusual low temperature CO oxidation activities of supported Au catalysis is that there is a wide variation in the reported CO oxidation activities over these catalysts [5]. This arises because these catalysts are very sensitive to the preparation procedures. Most supported Au catalysts are prepared with the chloride-containing chloroauric acid precursor, although there have been recent attempts to prepare these catalysts with precursors such as dimethyl gold acetonate [6], gold-phosphine complexes [7], and gold ethylene diamine complexes [8]. This discussion will focus on the complications that arise with chloride-containing precursors. 

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