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Azobenzoic acid

Dinitro-prp -azobenzoic Acid. See x,x -Dinitroazobenzene-4,4 -dicarboxylic Acid in Vol 1, p A651-L... [Pg.276]

Betaines 261 are stable crystalline compounds. Knowledge of their chemical reactions is still limited. Alkaline hydrolysis of aryl derivatives (261 R = Ar) gives the 2-azobenzoic acids 266 but the mechanism of this rearrangement is unknown. Reduction by tin and hydrochloric acid gives the hydrazides 267. Thermolysis of the p-tolyl compound (261 R = p-MeC6H4) (120 C at 0.1 mm Hg) gives the isomeric triazine (268 R = >-MeC6H4). Phosphorus pentasulfide converts the 2-methyl derivative (261 R = Me) into 2-methyl l,2,3-benzotriazinium-4-thiolate (272 R = Me) (Section in,B,15). [Pg.48]

Azobenzoic Acid Azodibenzoic Acid or Azobenzenedicarboxylic Acid, HOOO-C6H4-N N-CsH4-COOH, mw 270.24, N 10.37%. Three isomers 0,0 m,m - and p,p - are described in Beil 16, 228,232,233,236 (287). Of these only the para-isomer is of interest because its nitro- and dinitro- derivs form expl salts (see below)... [Pg.650]

Dinitro-p,p -azobenzoic acid see X,X -Dinitroazo-benzene4,4 -dicarboxylic acid 1 A651... [Pg.571]

The zinc-dust treatment serves to reduce and remove small amounts of azo compounds (notably o-azobenzoic acid) which always discolor the crude product. Attempts to purify the crude product by crystallization from 33 per cent alcohol invariably led to a darker colored product with the same melting point as the crude. The decolorizing carbon is not intended to decolorize the solution but to clarify the filtrate before the precipitation of the diphenic acid. [Pg.33]

Many organic acids, bases, and salts can act as depolarizers when ions are discharged which react easily with them. For example, p-nitrobenzoic acid in alkaline solution is reduced smoothly to p-azobenzoic acid. The sodium ions which are discharged react so rapidly with the nitro-group that the nitrobenzoic acid does not behave as an electrolyte but essentially as a depolarizer, particularly since the ions of the sodium... [Pg.4]

Azobenzene-4,4 -dicarboxylic Acid or p Azobenzoic Acid (called p,p -Azobenzosaure... [Pg.650]

Azobenzoic Acid Azodibenzoic Acid or Azobenzenedicarboxylic Acid, HOOC--... [Pg.650]

See other pages where Azobenzoic acid is mentioned: [Pg.130]    [Pg.650]    [Pg.650]    [Pg.650]    [Pg.651]    [Pg.651]    [Pg.480]    [Pg.374]    [Pg.650]    [Pg.650]    [Pg.650]    [Pg.650]    [Pg.650]    [Pg.651]    [Pg.49]    [Pg.66]    [Pg.49]    [Pg.650]    [Pg.650]    [Pg.650]    [Pg.650]    [Pg.651]    [Pg.651]    [Pg.650]    [Pg.650]    [Pg.650]    [Pg.651]    [Pg.292]    [Pg.650]    [Pg.650]    [Pg.650]    [Pg.651]    [Pg.651]   
See also in sourсe #XX -- [ Pg.181 , Pg.183 , Pg.188 ]



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