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4-Nitroso-5-imino-2-pyrazolines

Nitroso-5-imino-2-pyrazolines are capable of existing in several tautomeric forms, (XXXII), (XXXIII) and (XXXIV). Although there... [Pg.105]

Bromo-5-imino-3-pyrazolidinones are synthesized by Curtius rearrangement of the azides of 4-bromo-5-oxo-3-pyrazolin-3-carboxylic acids.697 4-Nitroso-5-imino-3-pyrazolidinones are believed to exist as the oximino tautomers.337 They are usually prepared by direct nitro-sation with nitrous acid.644-1339 1649 A Curtius rearrangement of 4-oximino-5-oxo-2-pyrazolin-3-carboxylic acid azide has also been used.337... [Pg.155]


See other pages where 4-Nitroso-5-imino-2-pyrazolines is mentioned: [Pg.140]    [Pg.63]    [Pg.85]    [Pg.94]    [Pg.147]   
See also in sourсe #XX -- [ Pg.87 ]




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