Benzoin benzoquinone

It oxidizes thiophenol to diphenyl disulphide, hydroquinone to p-benzoquinone, benzoin to benzyl, benzylic alcohols to the corresponding carbonyl compounds and cleaves hydrobenzoin to benzaldehyde. 

The stability of [Fe4S4] core was utilized for electron-transfer oxidation catalysis. With 1,4-benzoquinone as oxidant, benzoin was catalytically oxidized by... 

Table IV. Catalytic oxidation of benzoin by 1,4-benzoquinone in the presence of 4Fe-, 2Fe-, IFe-complexes...

Baeyer-Villiger reaction, 9, 3 43, 3 Bamford-Stevens reaction, 23, 3 Barbier Reaction, 58, 2 Bart reaction, 2, 10 Barton fragmentation reaction, 48, 2 Bechamp reaction, 2, 10 Beckmann rearrangement, 11, 1 35, 1 Benzils, reduction of, 4, 5 Benzoin condensation, 4, 5 Benzoquinones ... 

Benzophenone as sensitizer, 19 94 1,4-Benzoquinone, benzoin catalysis, 33 62 Benzoselenadiazole complexes, osmium, 37 290-291... 

Studies of the catalytic or stoichiometric reactions of various 4-Fe-ferredoxin model complexes have been reported using the 3-/2— redox couple with a negative redox potential91 >. Relatively stable are the 2—/I — redox couple for [Fe(Z-cyst-Ile-Ala-OMe)J2 (Z = benzyloxycarbonyl) or [Fe4S4(tipbt)J2 (tripbt = 2,4,6-triiso-propylbenzene-thiolato) in A, A -dimethylformamide. Catalytic oxidation of benzoin by 1,4-benzoquinone in the presence of various cyst-containing peptide complexes or bulky thiolato complexes in DMF has been examined. The postulated mechanism of the catalytic oxidation of benzoin in the presence of [Fe4S2(SR)4]2 is illustrated in Fig. 7. 

Benzoin, IV, 87 Benzoquinone, oxime, IV, 101 —, phytochemical reduction of, IV, 89 o-Benzoquinone, tetrabromo-, IV, 89 p-Benzoquinone, tetrahydroxy-, III, 48 Benzoxazole, 5-acetamido-2-methyl-, III, 351... 

The second type of composition is exemplified by a wide variety of acrylate- or methacrylate-ester derivatives of conventional ink vehicles combined with a photoinitiator 1. The reaction product of tung oil fatty acids, glycidyl methacrylate, -benzoquinone, and 2-methyl-imidazole mixed with tung oil and treated with tolylene diisocyanate, combined with benzoin methyl ether (26) 2. Glycerol-linseed oil-isophthalic acid alkyd reacted with isocyanate-containing prepolymer (formed by reaction of tolylene diisocyanate, -henzoquinone, 2-hydroxypropyl acrylate in ethyl acetate solution) using dibutyltin diacetate catalyst, combined with tung oil, synthetic varnish, and benzoin methyl ether (27) 3. Epoxidized... 

Benzils. Benzoins are readily oxidized by FeCl3-6H20 without solvent at 80°. Cyclobutenediones and p-henzoquinones. Iron carbonyl species are formed by reaction of the FeCl,-NaBH4 system with carbon monoxide. When alkynes are present, they are converted to cyclobutenediones or benzoquinones in situ. 

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