Diphenyl l-

Corey and Chaykovsky114 found that the dimsyl anion reacts with benzophenone and benzaldehyde to afford the corresponding /S-hydroxysulfoxides 109 and 110. Thermal decomposition of these j3-hydroxysulfoxides was shown to give a, )3-unsaturated sulfoxides155 or olefins156,157. Thus, the reaction of dimsyl anion with benzophenone at 100 °C gave 1,1-diphenylethylene, diphenylmethane, 1,1-diphenylcyclopropane and diphenylacetaldehyde, besides 1, l-diphenyl-2-methylthioethylene156,157. 

The alcohol was obtained by flash chromatography on silica gel eluting with petroleum ether-ethyl acetate (9 1) to eliminate the benzophenone and then with an eluant ratio 6 4, giving (S.S> 1, l-diphenyl-2-(S-phenylsulfoni-midoyl)-ethanol (790 mg, 2.3 mmol, 77%). 

H c6H5 CHa c h5 l-Nitro-2-phenyl-propan 1, l-Diphenyl-2-nitro-ethan 54 a... 

As early as 1963 Markl prepared the first representatives of this class of compounds via multi-step synthesis l,l-diphenyl-X -phosphorin 118 ( 1,1-diphenyl-phosphabenzene ) and 1,l-diphenyl-2,3-benzo-X -phosphorin i20 ( 1,1-diphenyl-phospha-naphthalene ). Neither compound could be obtained in crystalline form. Instead, treatment of the crystalline phosphonium salts iiP and 121 with aqueous alkali affords very reactive, air-sensitive yellow or orange powders 118 and 120). Acid treatment leads back to the phosphonium salts. 

To determine the magnetic field at which resonance occurs and the spacings between lines of a spectrum, the ESR spectrum of a standard sample is superimposed on the spectrum being observed. A commonly used standard is the stable solid radical 1, l-diphenyl-2-picrylhydrazyl (DPPH)—the last radical in Fig. 8.15. 

Ethane 2-Bromo-1,l-diphenyl-2-fluoio-l-methoxy- ElOb, 361 f. (En + FO-CH3)... 

A series of cationic, strapped, r)6 ri1 ri1-arene complexes of ruthenium(II) (82) containing both carbon and phosphorus as the auxiliary atoms has been obtained by a coupling reaction of the iminophosphorane complexes 83 with an excess of 1, l-diphenyl-2-propyn-l-ol, the p-cymene in 83 being displaced by one of the phenyl... 

Y2. Yamaguchi, T., Takamura, H., Matoba, T., and Terao, J., HPLC method for evalution of the free radical-scavenging activity of foods by using 1, l-diphenyl-2-picrylhydrazyl. Biosci. Biotechnol. Biochem. 62, 1201-1204 (1998). 

Ellison, R. D. and Holmberg, R. W. (1960). Cell dimensions and space group of 1,l-diphenyl-2-picrylhydrazine. Acto Crystallgr, 13,446-7. [203]... 

Famesylhydroquinone 335, which exhibited DPPH (1, l-diphenyl-2-picrylhydrazyl) radical scavenging activity, was separated from Penicillium sp. marine fiingi and the method of the preparation of this compound was described. 

Cyano-substituted cyclopropanes such as 1,1-diphenyl-tetra-cyanocyclopropane have been found to yield 1,l-diphenyl-2,2-dicyano-... 

It was found that both sensitivity and double exposure effect are reduced with mixing of a small amount of radical scavenger, 1,l-diphenyl-2-picrylhydrazyl ( DPPH ), into the PMPS. This indicates that radical reactions are involved in the mechanism of double exposure sensitivity enhancement. 

Transformations of arene substituents can also be achieved by transfer of an electron from a ground state donor to the excited state of the arene ring, or from an excited state donor to the ground state arene. Thus the retro Paterno-BUchi reaction of the benzo-phenone-tetramethylethylene oxetane (373) can be induced by irradiation in the presence of triethylamine as the electron donor. This yields 1,l-diphenyl-2-methylpropene the regiochemistry of this fragmentation is the opposite to that obtained by irradiation of electron acceptor arenes in the presence of (373), in which case benzophenone is the product. 

HATANO, T., EDAMATSU, R., HIRAMATSU, M., MORI, K., FUJITA, Y., YASUHARA, T., YOSHIDA, T., OKUDA, T., Effects of interaction of tannins with co-existing substances. VI. Effect of Tannins and Related Polyphenols on Superoxide Anion Radical, and on 1, l-diphenyl-2-picrylhydrazyl radical, Chem. Pharm. Bull, 1989,37, 2016-2021. 

The Schiff base of acetophenone XXI, after anionization with lithium diisopro-pylamide to the deep yellow solution of XXlI, led to the adduct XXIII (55% yield) upon combination with benzophenone. Treatment with diluted mineral acid converted XXIII in 95% yield to 1, l-diphenyl-2-benzoylethylene ... 

Nanjo, F. Goto, K. Seto, R. Suzuki, M. Kara, Y. Scavenging effects of tea catechins and their derivatives on 1, l-diphenyl-2-picrylhydrazyl radical. Free Radical Biol. Med. 1996,21, 895-902. 

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