Ruthenium arene containing

Although the in situ generation and use of XV is convenient, the presence of add also favors slow decomposition of XV. It was thus suitable to isolate catalyst XV by filtration of its addic solution on basic alumina [34]. Thus the indenylidene-ruthenium(arene) complexes containing various phosphines were isolated (Scheme 8.12). 

The moderate Lewis acidity of ruthenium complexes was used to promote catalytic Diels-Alder reaction of dienes and acrolein derivatives [21-23]. The enantioselective Diels-Alder reaction of methacrolein with dienes was catalyzed with cationic ruthenium complexes containing an arene or cyclo-pentadienyl (Cp) ligand and a chiral ligand such as phosphinooxazoline, pyridyl-oxazoline, monoxidized 2,2 -bis(diphenylphosphino)-1, T-binaphthyl (BINPO)or l,2-bis[bis(pentafluorophenyl)phosphanyloxy]-l,2-diphenylethane (BIPHOP-F). The reaction gave the cycloadduct in high yields with excellent... 

For details of other silyl-ruthenium compounds containing polyalkenes, azulenes and arenes, see reference 1, pp. 915-919. 

C4.2 Ruthenium clusters containing the [2.2]paracyclophane P.J. Dyson, B.F.G. Johnson and C.M. Martin, J. Cluster Set, 1995, 6, ligand recent developments in arene-cluster chemistry 21-37 (25)... 

Several arene-ruthenium complexes containing bidentate phosphine ligands have been shown to be useful catalyst precursors for the hydration of terminal aryl alkynes 105 to afford acetophenones 106 (Scheme 29) [52]. For example, the cationic complex 104, when activated by AgSbH5, promoted addition of water to a carbon-carbon triple bond. It was found that such reactions proceeded slowly but in good to excellent yields. It is remarkable, that the water in commercial acetone was sufficient to achieve complete conversion to the product. 

Chiral 1-alkyl-substituted tetrahydroisoquinolines have been obtained in excellent yield and with ee up to 95%, using A-sulfonylated diamines containing ruthenium arene complexes as catalysts (Fig. 80) (341). 

Scheme 14.2 The preparation of the first allenylidene-ruthenium-arene complex containing a NHC ligand.

Reaction of Ru(III)Cl3 with a precursor 1,4-cyclic diene gives rise to a Ru(II) arene dimer such as 14 (Fig. 2.4). This is often a convenient synthetic route to Ru(II) arenes, and the structures of several such dimers have been determined [34—36]. Recent interest in the design of ruthenium arene complexes as catalyst precursors has led to the exploration of a wide range of synthetic routes to complexes containing various arenes, substituted arenes, together with other ligands such as hydride, phosphines, aUcyl and aryl groups [37]. 

Figure 44 Arene-ruthenium complexes containing NHC ligands.

These ortho (hetero)arylation examples show that the combination of a simple ruthenium(II) catalyst in the presence of a carboxylate as a co-catalyst and with carbonate as the base leads to an excellent system for arylation of arenes containing... 

Simple ruthenium(II) catalysts can now perform heterocycle directed alkylation and Friedel-Crafts type reactions at orf/io-positions of arenes and heteroarenes. The former reaction takes places without p elimination and the latter reaction takes place without addition of Lewis acid to form arenes containing a ketone, amide, or ester functionality. Hydroarylation of strained alkenes can be performed to obtain ortho alkyl (hetero)arenes and alkylation of sp C-H bond can be observed using alcohol as a precursor. 

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