Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

1- Phenyl-2 diazenes

Carboxy-4-hydroxy-phenyl)-[4-(2 pyridylaminosulfonyl)-phenyl]-diazen... [Pg.3]

R Losungs- mittel. .. -phenyl-diazen [%] Azoxy- benzol [%] Anilin [%]... [Pg.101]

Als Reduktionsmittel kann auch Phenylhydrazin verwendet wcrden1. Setzt man z.B. l-(2-Nitroso-phenyl)-l-oxo-propan mit Phenylhydrazin im Verhaltnis 2 1 urn, bildet sich hauptsachlich Bis-[2-propanoyl-phenyl]-diazen-l-oxid. Setzt man aquimolare Mengen ein, bilden sich groflere Mengen 1,2-Benzoxazole (bis zu 95%) ... [Pg.122]

Bis-[2,3-dimethyl-phenyl -diazen- 1-oxid wird nach Methode in 70% Ausbeute gewonnen. 2,6-disubstituierte Nitrobenzole liefem anstelle der gewtinschten Azoxybenzole jedoch Aniline. [Pg.126]

Die elektrochemische Reduktion von Nitro-arenen zu Azoxy-arenen ist ebenfalls moglich. 2-Nitro-toluol liefert 99% Bis-[2-methyl-phenyl -diazen-l-oxid bei einer Stromausbeute von 98%. Als Anolyt wird 1 Af Schwefelsaure verwendet, als Katholyt ein Ethanol/Wasser-Gemisch (84 16), das pro Liter 0,4 mol Natriumhydroxid und 1 mol Edukt enthalt2. [Pg.129]

Benzoxazole reagieren unter nitrierenden Bedingungen zu Mono- oder Dinitro-2,1-benzoxazolen. 6-Nitro-2,l-benzoxazol jedoch bildet unter Ringspaltung Bis-[2-carboxy-3,5-dinitro-phenyl -diazen-l-oxidl[i6% Schmp. 225° (Zers.)]1 ... [Pg.131]

Die Bestrahlung von Azobenzolen in Anwesenheit von Sauerstoff fiihrt zu unterschied-lichen Resultaten. 4-Arylazo-l-hydroxy-naphthaline liefern nur 1,4-Naphthochinon. Kei-nerlei Oxidationsprodukte werden bei 4-Amino-4 -nitro-azobenzol erhalten. 4-Dimethyl-amino-2/,4 -dinitro-azobenzol liefert in 35-40% Ausbeute l-(4-Dimethylamino-phenyl)-2- (2,4-dinitro-phenyl)-diazen-l-oxid2. [Pg.133]

Ein ungewohnliches Produkt der Wallach-Umlagerung entsteht aus Bis-[2,4,6-trimethyl-phenyl]-diazen-l-oxid. In Abwesenheit freier p- oder o-Positionen wird die p-standige Me-thyl-Gruppe hydroxyliert1 ... [Pg.141]

Q>-n=nH0h-n, [(HsC4),P]aCuBH4/CHCl3 20-25°, 14 h ( 4-Amino-phenyl) -phenyl-diazen 69 t... [Pg.975]

Normally, the dehydrofluorination process is a 1,2-elimination, but an unusual 1,4-elimination of hydrogen fluoride is also observed in the formation of 15.38 However, the elimination is not concerted, but proceeds via an enolate in a multistep reaction. A second example involves the preparation of polyfluoroalkene(phenyl)diazenes 16a and b.39-40 Interestingly, for the derivative with Rf = C3F7, a 1,2-climination to the perfluoroalkene(phcnyl)hydrazone 16c is observed with phenylhydrazine as base rather than the 1,4-elimination to 16a and b found with triethylaminc.39... [Pg.357]

By far the greatest number of monoazo dyes of this type are based on diazotized 5-amino-3-phenyl-l,2,4-thiadiazole. A great variety of examples, their structure and properties modulated by a suitable choice of couplers are the subject of numerous, often very substantial3928 patent specifications.393-424 An example of more than ordinary interest is (3-phenyl-1,2,4-thiadiazol-5-yl)- [4-(4,7,10,13-tetraoxa-1 -azacyclopentadecyl)phenyl] diazen... [Pg.386]

Bis(ethylsulfonyl)butane Bis[4-(hexyloxy)phenyl]diazene, 1-oxide A/,A/ -Bis(2-hydroxybenzylidene)-1,2-ethylenediamine Bis(2-hydroxy-3-teff-butyl-5-methylphenyl)melhane Bis(2-hydroxy-5-chlorophenyl) sulfide... [Pg.175]

Bis[4-(hexyloxy)phenyl]diazene, 1-oxide C24H34N2O3 2687-42-0 398.638 schl... [Pg.166]

Systematic name Phenyldiazenol Chem. Abstr. Hydroxy(phenyl)diazene Traditional name Benzenediazo-hydroxide... [Pg.139]

Sodium phenyldiazenolate Hydroxy(phenyl)diazene, sodium salt... [Pg.139]


See other pages where 1- Phenyl-2 diazenes is mentioned: [Pg.192]    [Pg.783]    [Pg.101]    [Pg.102]    [Pg.119]    [Pg.120]    [Pg.122]    [Pg.122]    [Pg.129]    [Pg.129]    [Pg.130]    [Pg.135]    [Pg.141]    [Pg.369]    [Pg.847]    [Pg.781]    [Pg.174]    [Pg.166]    [Pg.364]    [Pg.136]    [Pg.99]    [Pg.153]    [Pg.197]    [Pg.198]    [Pg.224]    [Pg.185]    [Pg.186]    [Pg.196]    [Pg.197]    [Pg.497]    [Pg.503]   
See also in sourсe #XX -- [ Pg.91 ]




SEARCH



Diazen

Diazene

Diazene, phenyl

Diazenes—

© 2024 chempedia.info