Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1407259 | Journal of Molecular Structure | 2008 | 11 Pages |
Abstract
The 1H, 13C and 15N NMR data, conformation and dynamic behaviour of the new tetrathiacalix[4]arenes functionalized by hydrazide and hydrazone groups are reported and compared with the result of earlier investigations of 4-tert-butylphenoxyacetylhydrazones. The unusual fact of formation of N,Nâ²-diacetylhydrazine bridge and factors leading to its formation in the cone conformer of calixarene has been discussed. The barriers of rotation of hydrazone fragments of tetrathiacalix[4]arenes were determined by NMR-measurements at various temperatures. The structure of 1,3-alternate conformer of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis[hydrazinocarbonylmethyl]-2,8,14,20-tetrathiacalix[4]arene in solution is compared with crystal structure obtained by the X-ray analysis.
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Authors
Victor V. Syakaev, Sergey N. Podyachev, Aidar T. Gubaidullin, Svetlana N. Sudakova, Alexander I. Konovalov,