Gold carbonyl complex

The coordination of gold complexes to the —C -system activates them very efficiently in order to attack a nucleophile. The carbonylic double bond can also be activated for nucleophilic addition. 

CjHjS, Thiophene, tetrahydro-gold complexes, 26 85-87 C4H,NO, 2-Propenamide, 2-methyl-nickel complex, 26 205 C4H1()02, Ethane, 1,2-dimethoxy-solvates of chromium, molybdenum, and tungsten carbonyl cyclopentadienyl complexes, 6 343 tungsten complex, 26 50 ytterbium complex, 26 22 C4H i02.NaC5H5, Ethane, 1,2-dimethoxy-compd. with cyclopentadienylsodium, 26 341... 

SNC, Thiocyanate, gold complex, 26 90 SOOsPC56H45, Osmium, carbonyl(thio-carbonyl)tris(triphenylphosphine)-, 26 187... 

Bis(adamantylimido) compounds, with monomeric chromium(VI) complexes, 5, 348 Bis(alkene) complexes conjugated, Rh complexes, 7, 214 mononuclear Ru and Os compounds, 6, 401 -02 in Ru and Os half-sandwich rj6-arenes, 6, 538 with tungsten carbonyls and isocyanides, 5, 685 Bis(u-alkenylcyclopentadienyl) complexes, with Ti(II), 4, 254 Bis(alkoxide) nitrogen-donor complexes, with Zr(IV), 4, 805 Bis(alkoxide) titanium alkynes, in cross-coupling, 4, 276 Bis(alkoxo) complexes, with bis-Cp Ti(IV), 4, 588 Bis[alkoxy(alkylamino)carbene]gold complexes, preparation, 2, 288... 

Poor results were obtained over catalysts Pd/Polyl and Rh/Polyl with 3.1% and 1.1% yields, respectively, although Pd and Rh complexes were usually regarded as more effective catalysts in comparison with gold complexes for carbonylation reactions. Consequently, these An catalysts had exclusive catalytic activity for the carbonylation of epoxides with CO2, i.e., activation of CO2. To achieve a higher yield, a longer reaction time (lOh) was adopted over catalyst 0.05 wt% Au/Polyl, and an 89.5% ydeld was obtained. 

Reductions. Ketones are reduced with trialkoxysilane-histidine complexes. A gold complex (Ph,P)AuCl catalyzes hydrosilylation of the C=0 group. Dibenzenechromium > a preeatalyst in the reduction of aryl carbonyl compounds." A system comprising... 

The nucleophilic addition of alcohols to alkynes was reported by Utimoto with NaAuCU and later by Teles with cationic gold complexes.The enol ethers formed can be hydrolyzed to form carbonyl compounds or trapped as ketals (equations 4 and 5). An intramolecular version of this reaction was reported by the group of Genet to give bicyclic ketals (equation On the basis of this concept, a glycosidation... 

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