pyrazolinen.
/pʌɪˈrazəliːn/, /pᵻˈrazəliːn/, U.S. /paɪˈræzəˌlin/, /pəˈræzəˌlin/ Chemistry.
Each of three heterocyclic compounds having the formula C3H6N2 which are dihydro derivatives of pyrazole; spec. 2-pyrazoline; a substituted derivative of such a compound.There are three possible isomeric forms of pyrazoline, of which only one (more fully 2-pyrazoline), CH2CH2CHNNH, a colourless, basic liquid, has been prepared.
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pyrazoline1887
1887 Jrnl. Chem. Soc. 52 ii. 665 To examine whether the formation of pyrazoline-derivatives from phenylhydrazine and acids of the acrylic series is analogous to the formation of pyrazole-derivatives from unsaturated ketones.
1938 R. C. Fuson in H. Gilman Org. Chem. I. i. 30 Pyrazolines are unstable toward heat and decompose to give cyclopropane derivatives.
1967 C. H. Jarboe in R. H. Wiley Pyrazoles vi. 177 Examples of each of the three tautomeric pyrazoline structures..are well known, 2-pyrazoline being by far the most common.
1994 Jrnl. Agric. & Food Chem. 42 374 No bioactive conformation could be postulated for phenyl rings on either of the saturated carbons of the pyrazoline ring.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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n.1887