2,5-Cyclohexadien-1 -ones

An azo coupling reaction of monatomic phenols with diazotized 4-nitroaniline has been investigated. By HPLC, NMR, elemental analysis, UV and IR spectroscopy it has been shown that the azo derivatives of o-guaiacol, o- and m-cresols interact with an excess of diazonium in pH interval of 4,5-9,5 and form corresponding 4,4-di(4-nitrophenylazo)-2,5-cyclohexadien-1 -ones. 

Dtazo-2,5-cyclohexadien-1-one [called p-Benzquinonediazide by Anderson et al (Refs 2 3) and also Diazophenol (Ref 1)1 CH-----C( 0)---CH... 

Schuchmann MN, Steenken S, Wroblewski J, von Sonntag C (1984) Site of OH radical attack on dihydrouracil and some of its methyl derivatives. Int J Radiat Biol 46 225-232 Schuler RH, Albarran G, Zajicek J, George MV, Fessenden RW, Carmichael I (2002) On the addition of OH radicals to the ipso position of alkyl-substituted aromatics production of 4-hydroxy-4-methyl-2,5-cyclohexadien-1-one in the radiolytic oxidation of p-cresol. J Phys Chem A 106 12178-12183... 

Pentafluorophenol reacted with xenon difluoride in hydrogen fluoride or acetonitrile at -30 to +20 °C (Scheme 35) and the following products were observed perfluoro-2, 5-cyclohexadiene-l-one, 2-pentafluorophenoxy-perfluoro-3,5-cyclohexadiene-l-one, 4-pentafluorophenoxy-perfluoro-2,5-cyclohexadiene- 1-one and 2-pentafluorophenoxy-perfluoro-2,5-cyclohexadiene-l-one, the product distribution depending on the reaction conditions100,10. ... 

V-ethylv/V-(2-hydroxyethyl)lamino-4 -nitroazobenzene 7V-methyl-[4(lH)-pyridinylidene ethylidenel-2,5-cyclohexadien- 1-one... 

Guo, Z., Schultz, A. G. Preparation and Photochemical Rearrangements of 2-Phenyl-2,5-cyclohexadien-1-ones. An Efficient Route to Highly Substituted Phenols. Org. Lett. 2001, 3, 1177-1180. 

Aurine Corallin or 4,4 -Dihydroxyfuchsone, called in CA 4>[Bis(p-hydroxyplienyl) methylenel-2,5-cyclohexadien-1-one and in ... 

Ozonization for water disinfection is returning instead of chlorination however, it is not devoid of potential dangers when micropollutants react with ozone. Thus, an aqueous solution of 3-phenylenediamine (lk) led to formation of the strongly mutagenic 2-amino-5-[(3-aminophenyl)amino] -4- (3-ami nophenyl)imino] -2,5-cyclohexadien-1 -one (66)89. 

According to121), 2,6-diphenyl-4-tert-butylperoxy-4-methoxy-2,5-cyclo-hexadien-l-one is decomposed under formation of methyl alcohol and 2,6-di-phenyl-l,4-benzoquinone. 4-tert-Butylperoxy-2,4,6-tri-tert-butyl-2,5-cyclohexadiene-1-one XXXVI (R = R1 = tert-Bu) is thermolyzed already at 65 °C to the mixture of compounds, where 2,6-di-tert-butyl-l,4-benzoquinone XXII was identified as the main component31,13°) the mixture contained, according to GPC, also 3,5-di-tert-butyI-4-hydroxybenzaldehyde XXXII and stilbenequinone XXIX. 

This results in the formation of polyphenylene oxide (PPO) or diphenoquinone (4-(3,5-dimethyl-4-oxo-2,5-cyclohexadiene-l-ilidene-2,6-dimethyl-2,5-cyclohexadiene-1-one). 

Diazo compounds (natural). Various types of D. c. occur in nature. Thus, derivatives of diazoacetic acid ( azaserine) and diazoketones ( 2-amino-6-diazo-5-oxohexanoic acid) are known as metabolic products of streptomycetes with anti-tumor activity. Quinonedi-azide ( 4-diazo-2,5-cyclohexadien-1 -one) and phenyl-diazonium salts [ 4-(hydroxymethyl)benzenediazo-nium ion] have been detected in the ffuitbodies of the mushroom genus Agaricus. Further biologically active... 

Allyl-4-[2-hydroxy-1 -methyl-2-(3,4-methylenedioxyphenyl)ethyl]-4,5-dimethoxy-2,5-cyclohexadien-1 -one, A-30069... 

Other Names 2,5-Cyclohexadien-l-one, 4-[te(p-hydroxyphenyl)methylene]- Aurin 4,4 -Dihydro-xyfuchsone 4-(p,p -Dihydroxybenzhydrylidene)-2,5-cyclohexadien-1 -one 4-[5 (p-hydroxyphe-nyl) methylene]-2,5-cyclohexadien-l-one Aurin 555 Aurine C.1.43800 Corallin Corallin Spirit Soluble NSC 7805 Pararosolic acid Rosalie acid Spirit Aurine p-Rosolic acid CA Index Name 2,5-Cyclohexadien-l-one, 4-[ w(4-hydroxyphenyl)methylene]-CAS Registry Number 603-45-2 Merck Index Number 881 Chemical Structure... 

Hydroxy-5-methoxy-4,4-dimethyl-2- l oxo-3-phenyl-2-propenyl)-2,5 cyclohexadien- 1-one. 2-Cinnamoyl-3-hydroxy-5-methoxy-4,4-dimethyl-2,5-cyclohexadien-l-one [56015-03-3]... 

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