Phenyl, antimony complexes

NOCgHj, Benzoyl isocyanide, chromium complex, 26 32,34,35 N0C,3H,3, Formanide, N-(l-(l-naphthal-enyl)ethyll-, rhenium complex, 29 217 NOPCjsHjj, Benzamide. 2-(diphenylphos-phino)-N-phenyl-, 27 324 NOPCjjHjj, Benzamide, Af-[2-(diphenyl-phosphino)phenyl]-, 27 323 NO2CH3, Methane, nitro-, antimony complex, 29 113 cobalt complex, 29 114 NOjCjHj, 4-Pyridinecarboxylic acid, rhodium complex, 27 292 NO2P2C3JH33, Phosphorus(l-t-), p-nitrido-bis(triphenyl-, acetate, 27 296 NO2SC3H7, L-Cysteine, molybdenum complex, 29 255,258... 

Depending on the substituents in (61) and on the concentration of the catalyst, however, other products may also subsequently be formed. In some cases, SbCl5-complexed primary intermediates of type (65) could even be isolated and characterized by NMR spectroscopy as well as by well-defined chemical reactions (81JA1789). Treatment of tetraphenyl-1,2,4-trioxolane (67) with antimony pentachloride or liquid sulfur dioxide, a mild Lewis acid, gave benzophenone and phenyl benzoate in a molar ratio of 1 1 (80JA288). The formation of the ester corresponds to that of the carboxylic acid from (61) via path A or path B. 

Despite this they should be considered as possible alternatives in cases where more familiar methods fail. Amongst this group of activators are p-toluenesulfonyl chloride, trifluoromethanesulfonic anhy-dride, - silver tetrafluoroborate, molybdenum oxide, phosphorous pentoxide, trichloromethyl chloroformate, 2-fluoro-l-methylpyridiniumsulfonate, chlorosulfonyl isocyanate, antimony penta-chloride (for which an X-ray structure of the DMSO-SbCls complex was obtained) and phenyl dichlo-rophosphate. ... 

Mesitylene " and hexaethylbenzene each give 1 1 complexes with half-sandwich structures with antimony trichloride and a similar 1 1 complex is known for the tribromide with mesitylene. The 2 1 adduct of antimony tribromide with biphenyl is centrosymmetric with a molecule of the antimony halide coordinated to each phenyl group and on opposite sides a similar picture is found with 2SbCl3.(2,2 -dithienyl), 2SbBr3-(9,10-dihyd-roanthracene) and 2SbCl3. (pyrene) . In the complex of [2.2.2]paracyclophane with two molecules of SbCl3, two of the benzene rings are almost symmetrically coordinated to antimony . 

Diphenylantimony tribromide and acetonitrile form a weak 1 1 complex and, in keeping with the observation that the solvent molecule is readily lost even at room temperature, there is a long Sb N contact (2.53 A) The antimony geometry is distorted octahedral with phenyl groups occupying trans positions the Sb—Br bond trans to acetQnitrile is substantially shorter (2.519 A) than those trans to each other (2.605 A). 

Aminopyrine (4-dimethylamino-2,3-dimethyl-l-phenyl-3-pyrazo-lin-5-one) forms complexes similar to those of antipyrine, but usually containing fewer molecules of the 3-pyrazolin-5-one. Complexes with mercury, cadmium, antimony, zinc and cobalt salts include only one molecule of aminopyrine. A number of complexes with cobalt, zinc and calcium salts have two molecules of aminopyrine, some also containing acid and water of hydration.736,1322 The complex with cerous nitrate contains three molecules of aminopyrine.1238 A few other substituted... 

Analogs of 29, with ter/-butyl or diisopropylamino groups instead of the phenyl substituents, have been synthesized using the procedure introduced by Ofele. These complexes were treated with silver trifluoromethanesulfonate and antimony(V) chloride, thereby removing one chloride ligand leading to coordinatively unsaturated species. 

A spectrophotometric procedure has been described184 based on the formation of a coloured complex with antimony pentachloride in carbon tetrachloride, for the determination of 0.01-1.0% biphenyl in phenyltrichlorosilane. These workers also described a spectrophotometric method for the determination of 0.01-10% biphenyl in phenyltrichlorosilane based on measurement of the difference in extinction of solutions of the sample and a standard in chloroform-ethanol at 251 nm. The determination of biphenyl in phenyltrichlorosilane and its hydrolysis products have also been discussed185 The extinctions of pure phenyl trichlorosilane and the sample are measured at 251 nm in chloroform ethanol 1 1 the difference is related to the content of biphenyl, which absorbs 60 times more strongly than phenyltrichlorosilane at that wavelength 0.05-10% of biphenyl may be determined. 

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