IR spectra

Synthesis and Ways of Formation of Hydroxyphenyl Substituted Triazolohexahydroquinazolines

Authors: Demidova D. M., Vasilkova N. O., Krivenko A. P.

With three-component condensation of 1,2,4-triazol-3-amine, hydroxy-substituted aromatic aldehyde (2-hydroxybenzaldehyde, 4-hydroxybenzaldehyde, 4-hydroxy-3-methoxybenzaldehyde, 2-naphthalene-carbaldehyde), cyclohexanone, the aldehyde component has a defining impact on the shaping of triazologic hydroquinazolines with different types of rings articulation and the position of the double bond in them (C4a–C5 and C4a–C8a). When salicylic aldehyde is used, the positional isomers of the triazologic hexahydroquinazolines of angular and linear structure are formed in an equimolar ratio.

Qualitative and Quantitative Estimation of Intramolocular Hydrogenic Communication in a Row of Orto-R-phenyl-substituted Tetrazolohexahydroquinazolines

Authors: Vasilkova N. O., Aniskov A. A., Krivenko A. P.

The onе-pot interaction of C-aminotetrazole, cyclohexanone and o-R-benzaldehydes (in contrast to unsubstituted benzaldehyde benzaldehyde) leads to the formation of additionally linear tetrazohexahydroquinazolines, their isomers with an angular articulation of the rings. The appearance of isomers with angular articulation of the rings can be explained by the total influence of the spatial and electronic effects, and the influence of the low-energy interaction by the type of hydrogen binding NH ··R (VVS) can not be ruled out.

Thermal Isomerization of O-Chlorophenyltetrazolocyclanopyrimidine with Different Structure Types

Authors: Vasilkova N. O., Krivenko A. P., Filimonova V. N.

Temperature dependence of the 1H NMR spectra and TLC data suggest turning the corner isomers of о-сhlorоpheniltetrazolocyclanopyrimidine in the thermodynamically more stable linear forms. The IR spectra were recorded isomeric azide intermediate transformations.

Reaggregation Positional Isomers Tetrazologeksahidroquinazoline

Authors: Vasilkova N. O., Borisova M. Y., Yurasov N. A., Krivenko A. P.

9-phenyl-4,5,6,7,8,9-geksagidrotetrazolo[5,1-b]quinazoline in solution undergoes reaggregation ent via an azide to form a positional isomer corner structure that is installed involving spectral methods (1H-NMR, IR -spectra), TLC, chromato-mass spectrometry.