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2.3.5.6- Pyrazinetetracarboxylic acid

Pyrazinetetracarboxylic acid forms a dianhydride on treatment with acetic anhydride,234 which is useful in the preparation of polyamides and polyimides.235-236 For example, polymeric material is obtained by reaction of the dianhydride with 4,4 -diaminodiphenyl ether. [Pg.144]

Pyrazinetetracarboxylic acid is converted into tetra(trifluoro-methyl)pyrazine by the action of sulfur tetrafluoride [Eq. (13)].244... [Pg.146]

On treatment with alkaline potassium permanganate phenazine undergoes ring cleavage to give either quinoxaline-2,3-dicarboxylic acid [1, yield 70% mp 190°C (dec.) ] or. under more vigorous reaction conditions, pyrazinetetracarboxylic acid (see Houben-Weyl, Vol. 4/1 b, p 641 and 643). [Pg.296]

See other pages where 2.3.5.6- Pyrazinetetracarboxylic acid is mentioned: [Pg.69]    [Pg.117]    [Pg.457]    [Pg.69]    [Pg.454]    [Pg.469]    [Pg.276]    [Pg.141]    [Pg.69]    [Pg.117]    [Pg.457]    [Pg.141]    [Pg.69]    [Pg.454]    [Pg.469]   
See also in sourсe #XX -- [ Pg.69 , Pg.117 ]

See also in sourсe #XX -- [ Pg.69 , Pg.117 ]



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