Chemistry of Heterocyclic Compounds p. 1266 - 1269 (1984)
Update date:2022-09-26
Topics:
Perevalov, V. P.
Andreeva, M. A.
Shmelev, L. V.
Stepanov, B. I.
The reaction of 1,2,3,(5)-trimethylpyrazolium iodide with aromatic aldehydes yielded the series of 1,2-dimethyl-3(5)-(4-R-styryl)pyrazolium iodides (R = H, NMe2, NO2).The quantitative ratio of 1-methyl-3- and -5-(4-R-styryl)pyrazoles formed in the thermal decomposition of the above-mentioned pyrazolium iodides depends on steric factors in the initial compounds and on the electronic influence of the substituent R.A simple method was proposed for the production of trans,trans-1,4-bis(1-methyl-3-pyrazolylvinyl)benzene and 1-methyl-3,5-distyrylpyrazole, which possess fluorescent properties.
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