4 Phenyl styryl ketone

The Sn2 mechanism is ruled out for reaction between the tertiary halide, r-BuBr, and radical anions derived from the more easialy reduced compounds cinnamonitrile (9) ethyl cinnamate (12a), methyl styryl ketone (23a), and phenyl styryl ketone (20a). Reduction of the activated alkenes in the presence of an excess of r-BuBr leads to mixtures of products where a r-Bu group has been introduced in a- or j0-position or in the phenyl ring. For 9 and 12a small amounts of butylated hydrodimers were obtained in addition, and for the enone 23a formation of the unsaturated alcohol with introduction of the /-Bu group at C-1 was a major product [192]. In this case the mechanism is unambiguously reduction of the activated alkene followed by electron transfer to r-BuBr concerted with halide cleavage, in... 

Phosphorus trichloride, benzal acetophenone (phenyl styryl ketone) and acetic anhydride react at room temperature forming acetyl cliloride and a compound which yields a ketophosphinic acid with water. The intermediate product is a thick oil, supposed to be a mixture of the acid chloride I and the acid anhydride II, both of which are decomposed by water to form the phosphiiiic acid ... 

CH[PO(OH)2].CHBr.CO.CgH5, may be obtained by brominating -benzoyl-a-phenylethylphosphinie acid or by bromination as shown on p. 128 (compound III). It is a white, crystalline solid, M.pt. 196° C., converted by sodium carbonate, bicarbonate or hydroxide into phenyl styryl ketone, sodium bromide and sodium phosphate. When a boiling chloroform solution of the bromo-acid is treated with 1 equivalent of thionyl chloride, it yields the acid chloride, which with phenol gives the monophenyl ester, a crystalline product, M.pt. 179° C. The ester is best obtained by brominating phenyl jS-benzoyl-a-phenyl-ethylphosphinate described overpage it forms a sodium salt with cold dilute sodium hydroxide, but if the reaction be carried out with VOL. XI. III. 9... 

The addition of phenyldichlorophosphine to phenyl styryl ketone (benzal acetophenone) in acetic acid solution yields exactly the same types of compounds as are obtained by the use of phosphorus trichloride (p. 127). The structure of the various compounds is proved as before by resorting to bromination. The product... 

Diphenyichloropliospliiiic reacts witli benzaideliyde and with benzal-acetophenone (phenyl styryl ketone) in the presence of j lacial acetic acid according to the schemes ... 

P " Benzoyl - a - phenylethylphosphinic acid, CgH5.CH[PO(OH)2]. CH2.CO.CgH5.—This acid occurs when the phenyl p-methoxyst uyd ketone in the preceding preparation is replaced by phenyl styryl ketone (benzal acetophenone). The product contains 0 75 molecule of water of crystallisation, which is lost at 116° C. when the compound melts. 

Polymers containing the methyl methacrylate moiety followed by a spacer and a chalcone moiety are photocrosslinkable [30]. A chalcone contains the phenyl carbonyl ethylene phenyl sequence, or a phenyl styryl ketone. A methacrylate containing example is 4-[4[biphenyl oxy carbonyl phenyl oxy carbonyl] phenyl carbonyl ethylene phenyl] oxy butyl methacrylate. 

Dihydroxycha]kone (2 S-Dihydroxy-phenyl styryl ketone),... 

Conjugation on both sides of the double bond of the carbonyl group does give an appreciable additional shift [98] and drives the frequency down to the 1660 cm" region. Isomeric forms are again found giving rise to multiple bands. Phenyl styryl ketone for example absorbs at 1669 and 1648 cm" ... 

The oxidation of sulfamethoxazole by NH4VO3 in H2SO4 is first order in each reactant. Mechanisms have been proposed for the vanadium(V) oxidation of phenol and /3-naphthol in acidic media the reaction is first order in vanadium(V) in both systems and first order in substrate and acid in the case of the phenol system, but second order in substrate and independent of acid in the j8-naphthol system. In the vanadium(V) oxidation of phenyl styryl ketones (PSKs) under acidic conditions, benzoic acids and phenylacetaldehydes are produced via a proposed mechanism in which the carbonyl group is attacked by vanadium(V). The stoichiometry of the reaction is 2 1 [vanadium(V) PSK] and the rates are enhanced by electron-releasing substituents in both phenyl rings and retarded by electron-withdrawing substituents. The micellar-catalysed oxidation of glycine by vanadium(V) is first order in oxidant... 

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