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11.
I. A. Strakova E. Yu. Gudrinietse Ya. Ya. Linaberg A. Ya. Strakov D. R. Kreitsberga 《Chemistry of Heterocyclic Compounds》1970,6(4):481-485
The alkylation of 4-oxo-3,6,6-trimethyl-4,5,6,7-tetrahydroindazole with alkyl halides forms mixtures of 1-alkyl and 2-alkyl derivatives which have been separated by fractional crystallization from n-hexane. The 4-oxo-1-alkyl-,-1-aryl-, and -1-acyl-4,5,6,7-tetrahydroindazoles have characteristic frequencies in their IR spectra at 1540-1530 cm–1, and the corresponding 2-substituted derivatives have frequencies at 1565-1555 cm–1. The introduction of an alkyl substituent at a nitrogen atom decreases the basicity of 4,5,6,7-tetrahydroindazole by 0.6 orders of magnitude, the 1-alkyl isomers being somewhat stronger bases than the 2-alkyl isomers. 相似文献