Gold complexes silyl

In the case of the formation of gold complexes from gold oxonomium reagents, elimination of H20 drives the reaction as in Eqs. (48)-(52).130 131-350 382 In Eq. (50), both silyl and water elimination are active. 

OLuSiC,HH24, Lutetium, bis(T] -cyclopenta-dienyl)(tetrahydrofuran)[(trimethyl-silyl)methyl]-, 27 161 O, Oxide, gold complex, 26 326 ON, Nitrosyls, molybdenum and tungsten, 26 132, 133... 

Siloxane compounds, in vitreous silica manufacture, 22 414 Siloxane materials, 20 240 Siloxane oligomers, in silicone polymerization, 22 555-556 Siloxanols, silylation and, 22 703 Silsesquioxane hybrids, 13 549 Silsesquioxanes, 15 188, 22 589-590 SilvaGas process, 3 696, 697 Silver (Ag), 22 636-667. See also Silver compounds. See Ag entries Argentothiosulfate complexes Batch desilverizing Lead-silver alloys Palladium-silver alloy membranes analytical methods for, 22 650-651 applications of, 22 636-637, 657-662 as bactericide, 22 656, 657, 660 barium alloys with, 3 344 in bimetallic monetary system, 22 647-648 in cast dental gold alloys, 8 307t coke formation on, 5 266 colloidal precipitation color, 7 343t colloidal suspensions, 7 275 color, 7 334, 335... 

A gold monohydride species was also suggested in the report by Ito and Sawamura et al. on the dehydrogenative silylation of alcohols by HSiEt3 and a diphosphine gold(I) complex. Reaction was selective for the silylation of hydroxy groups in the presence of alkyl halides, ketones, aldehydes, alkenes, alkynes and other functional groups [193]. 

Gold(I) ylide complexes of various types have been prepared (45). Reactions of [AuCIL] complexes with ylides led initially to monoylide species (49), but displacement of L also occurred with excess ylide [Eq. (16)]. Analogous compounds with one or two a-silyl groups were also obtained. 

A different example of gold-catalyzed alcohol activation is the silylation of primary alcohols. In this reaction, aliphatic, allylic, and benzylic primary alcohols undergo silylation with an Au(I)-xantphos chelated complex. ... 

Reaction of silyl enol ethers with complex (phosphine)gold(I) halides in the presence of caesium fluoride (equation 9)26, or of enol ethers with [(Ph3PAu)30][BF4]25. 

Dewhurst et al have reported the fluoride-mediated protodesilylation of silylated propargylidynes in the presence of rhodium, ruthenium,iridium, " gold and mercury complexes to provide a range of C3-spanned heterobi- and trimetallic complexes. 

The Conia-ene reaction of P-ketoesters bearing a pendant triple bond involves the cycloisomerization of an enyne formed by enolization. This transformation is efficiently catalyzed by cationic gold(I) complexes and afforded cyclopentane derivatives with excellent yields and moderate to good diastereoselectivities (Scheme 4-40). Acetylenic silyl enol ethers or imines react in an analogous manner. By this method, iodoalkynes were converted into iodocyclopentenes, which are highly useful in natural product synthesis. 

Gold-NHC complexes have been shown to be suitable synthons towards the C-H activation of alkynes. The reaction of the air-stable (IPr)Au(OH) with either terminal or silyl-protected alkynes led to the characterisation of three structures , A-bis-, and l,3,5-tr -(IPrAuC=C)benzene. While... 

Cheon CH, Kanno O, Toste FD. Chiral Brpnsted acid from a cationic gold(I) complex catalytic enantioselective protonation of silyl enol ethers of ketones. J. Am. Chem. Soc. 2011 133 13248-13251. 

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