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PYRAZOLES, PYRAZOLINES, AND PYRAZOLONES

See Antibiotics, NUCLEOSIDES AND NUCLEOTIDES Chemotherapeutics, anticancer Nucleic acids. [Pg.305]

The compounds of this article, ie, ftve-membered heterocycles containing two adjacent nitrogen atoms, can best be discussed according to the number of double bonds present. Pyrazoles contain two double bonds within the nucleus, imparting an aromatic character to these molecules. They are stable compounds and can display the isomeric forms, (1) and (2), when properly substituted. Pyrazoles are scarce ia nature when compared to the imidazoles (3), which are widespread and have a central role ia many biological processes. [Pg.305]

Pyrazolones, also containing two double bonds, are predominantiy ia the keto form (4), although they can also exist ia the enol form (5). [Pg.305]

Pyrazolines have only one double bond within the nucleus and, depending on the position of the double bond, can exist ia three separate forms l-pyrazoliue [2721 3-9] (6), 2-pyrazoliae [109-98-8] (7), and 3-pyrazoliae [6569-23-9] (8). [Pg.305]

Kirk-Othmer Encyclopedia of Chemical Technology (4th Edition) [Pg.305]


PYRAZOLES, PYRAZOLINES AND PYRAZOLONES] (Vol 20) MVPI. See Mobil s Vapor Phase Isomerization Process. [Pg.653]


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2-pyrazoline

Pyrazoles pyrazolines

Pyrazolinate

Pyrazolines

Pyrazolon

Pyrazolone

Pyrazolons

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