2- Methoxy-2,4-diphenyl-3 complex

Complexes having a tridentate A,A,C chelate derived from 2,9-diphenyl-phen,1944 4-(4-methoxy-phenyl)-6-phenyl-2,2 -bipyridine,1945 6-benzyl-2,2 -bipyridine,1946 or 6-But-2,2 -bipyridine1946 have been prepared from heating solutions of the ligand and [AuCl4] with the assistance of a silver salt. Equation (18) shows one example. 

In the photochemical one-electron oxidation of aromatic sulfides, dimer radical cations were formed in rapid equilibrium with monomeric radical cation (59). The complex formation of a- and tt-types has been shown to be sensitive to the steric and electronic influence of substituent. For the case of jo-(methylthio)anisole the formation of TT-type dimer was shown to be reduced due to steric hindrance of two methyl groups. No formation of dimer radical cation was observed for jo-(methoxy)thioanisole and diphenyl disulfide where the corresponding monomer radical cations are stabilized by the delocalization of positive charge on the sulfur atom. Density-functional calculations supported the experimental results. The intramolecular formation of similar radical... 

Azepine, 2-methoxy- H NMR, 7, 496 (77BCJ2013) l//-Azepine-l-carboxylic acid 13C NMR, 7, 498 (80AG(E)1016) l//-Azepine-l-carboxylic acid, methyl ester, tricarbonyliron complex X-ray, 7, 494 (70JCS(B)1783) 4//-Azepine-2-carboxylic acid, 6,7-diphenyl-, methyl ester... 

If an achiral ferrocene derivative is converted to a chiral one by chiral reagents or catalysts, this may be called an asymmetric synthesis. All asymmetric syntheses of ferrocene derivatives known so far are reductions of ferrocenyl ketones or aldehydes to chiral secondary alcohols. Early attempts to reduce benzoylferrocene by the Clemmensen procedure in (5)-l-methoxy-2-methylbutane as chiral solvent led to complex mixtures of products with low enantiomeric excess [65]. With (25, 3R)-4-dimethylamino-l,2-diphenyl-3-methyl-2-butanol as chiral modifier for the LiAlH4 reducing agent, the desired alcohol was formed with 53% ee (Fig. 4-9 a) [66]. An even better chiral ligand for LiAlH4 is natural quinine, which allows enantioselective reduction of several ferrocenyl ketones with up to 80% ee [67]. Inclusion complexes of ferrocenyl ketones with cyclodextrins can be reduced by NaBH4 with up to 84% enantioselectivity (Fig. 4-9 b) [68 — 70]. 

The hydrolysis of 4-acetamido-1,1-dimethoxy-2,6-diphenyl--X -phosphorin gives 2,6-diphenyl-1-methoxy-1,2,3,4-tetra-hydro-X -phosphorin-4-one 1-oxide and 1,4-dihydro-2,6--diphenyl-1-methoxy-X -phosphorin-4-one 1-oxide, which can be converted into 2,6-diphenyl-1,1,4-trimethoxy-X --phosphorin and characterized as the stable crystalline tricarbonylchromium complex (32) (Dimroth and M. Liickoff, Ber., 1980, 113, 3313). 

The synthesis of 6,6 -bis-(5,6-diethyl[l,2,4]triazin-3-yl)-2,2-bipyridyl, the first example of a new class of tetradentate reagent for the efficient separation of americiumflll) and europium(III) has been described <05ICC239>. The synthesis and characterization (including X-ray) of Cd(II), Zn(II), Pb(II), Co(III) and Ni(II) complexes of 5-methoxy-5,6-diphenyl-4,5-dihydro-2/f-[l,2,4]triazine-3-thione have been reported <05POL1435>. 

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