Phenol, rhodium complex

C,H 0, Phenol, rhodium complex, 27 292 OH,S, Benzenethiol, osmium complex, 26 304... 

CgHjN, Pyridine, osmium complex, 26 291 CgHjNOj, 4-Pyridinecarboxylic acid, rhodium complex, 27 292 CgHg, Benzene, chromium complex, 28 139 QHgO, Phenol, rhodium complex, 27 292 CgHgS, Benzenethiol, osmium complex. 26 304... 

Kollner et al. (29) prepared a Josiphos derivative containing an amine functionality that was reacted with benzene-1,3,5-tricarboxylic acid trichloride (11) and adamantane-l,3,5,7-tetracarboxylic acid tetrachloride (12). The second generation of these two types of dendrimers (13 and 14) were synthesized convergently through esterification of benzene-1,3,5-tricarboxylic acid trichloride and adamantane-1,3,5,7-tetracarboxylic acid with a phenol bearing the Josiphos derivative in the 1,3 positions. The rhodium complexes of the dendrimers were used as chiral dendritic catalysts in the asymmetric hydrogenation of dimethyl itaconate in methanol (1 mol% catalyst, 1 bar H2 partial pressure). The enantioselectivities were only... 

Copper compounds are catalysts for the Michael addition reaction (249), olefin dimerizations (245, 248), the polymerization of propylene sulfide (142), and the preparation of straight-chain poly phenol ethers by oxidation of 2,6-dimethylphenol in the presence of ethyl- or phenyl-copper (209a). Pentafluorophenylcopper tetramer is an intriguing catalyst for the rearrangement of highly strained polycyclic molecules (116). The copper compound promotes the cleavage of different bonds in 1,2,2-tri-methylbicyclo[1.1.0]butane compared to ruthenium or rhodium complexes. Methylcopper also catalyzes the decomposition of tetramethyllead in alcohol solution (78, 81). 

Phenols are used as the nucleophile in the asymmetric aUylation of 7r-aUylpalladium complexes. Trost and Toste attained asymmetric phenyl ether formation in high enantiomeric excess (ee) using diphosphine ligand derived from chiral 1,2-cyclohexanediamine (equation 10). Dynamic kinetic resolution of the racemic secondary aUylic carbonate is conducted in the presence of tetrabutylammonium chloride, which increases the rate of ft—a—ft isomerization of the jr-allyl palladium intermediate (equation 11). Lautens and coworkers cleaved meio-oxabicyclic alkenes with phenol in the presence of a catalytic amount of a chiral ferrocenyldiphosphine and a rhodium complex (equation 12). ... 

SCHEME 150. Phenolic oxidation with nickel dioxide or catalytic rhodium complex... 

The alkylation of phenols with isoprene and isoprene derivatives can be catalyzed over rhodium complexes of TPPTS [22], In the case where the isoprene derivative is myrcene, methanol is added to the reaction mixture. The apparent benefit is to increase reaction rates with the highly water-soluble myrcene substrate. The alkylation of 2-naphthol with myrcene is shown in Eq. (2). In 2 h at 100 °C in aqueous methanol a 40% conversion of myrcene is observed (160 turnovers). 

Rhodium catalyzed alkyne oxidation is proposed to effect ketene generation from 4-methoxyphenylacetylene with oxygen transfer from pyridine N-oxides, with capture of the rhodium complexed ketene 32 by nucleophiles, including phenols and amines (Scheme 4.11). In the presence of... 

Although extremely rare, a recent report documents the intramolecular S -type displacements of (TPP)Rh-alkyl complexes (TPP = tetraphenylporphyrin) by alcohols and phenols to form THFs (Scheme 19). The intermediate rhodium alkyl complexes are themselves prepared by anti-Markovnikov hydrorhodation, and although the (TPP)Rh-H... 

Raymond and co-workers have synthesized and separated optical and geometrical isomers of simple tris hydroxamate chroniium(III) and tris phenolate chromium(III) or rhodium(III) complexes and assigned the absolute configurations of these isomers based on criteria such as chromatographic behavior due to differences in dipole moment, theoretical symmetry considerations, and X-ray crystallographic data 174). The absolute configuration of isomers of chromium(III) complexes of ferrichrome, ferrichrysin 175), ferrioxamine B and Dx 176), rhodotorulic acid 177), enterobactin 178),... 

The parent oxacalix[3] arenas show little ability to bind alkali metals,however, a range of quaternary ammonium cations are attracted to the symmetric cavity. Deprotonation of the phenol moieties allows them to bind to transition metals (scandium, titanium, vanadium, rhodium, molybdenum, gold, etc.), lanthanides (lutetium. yttrium, and lanthanum), and actinides (uranium as uranyl). Oxacalix[3]arenes derivatized on the lower rim can complex gallium, mercury, and alkali metals, including sodium, in a manner reminiscent of natural transmembrane cation filters. One major use was to purify crude samples of fullerenes. The pseudo-Cs symmetry of the macrocyclic cavity is complementary to threefold symmetry elements of Cgo. which binds preferentially in... 

A rhodium carbonyl cluster, Rh (CO)j, catalyzed benzene hydroxylation in acetonitrile via the formation of an arene x-complex containing also an activated form of HjO [75]. A decamethylosmocene-based system, (MegCgl Os/H O /py, that effectively generates HO radicals, produced phenol in a yield of 22% [76]. 

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