Structural studies on some 1,3,5,7-tetraazabicyclo-[3.3.1]-nonane derivatives |
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Authors: | L. Stefaniak T. Urbanski M. Witanowski A.R. Farminer G.A. Webb |
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Affiliation: | Institute of Organic Chemistry, Polish Academy of Sciences, 01-224 Warszawa, Poland;Department of Chemical Physics, University of Surrey, Guildford, Surrey, England |
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Abstract: | From a study of the 1H NMR spectra of a number of 3,7-disubstituted derivatives of 1,3,5,7-tetraazabicycio - [3.3.1] - nonane it is concluded that these molecules exist in either chair-chair or flattened chair-chair conformations. The derivatives containing COCH3 and NO substitutents have room temperature spectra consistent with restricted rotation about their NC and NN bonds respectively. High temperature spectra reveal an activation energy, for the rotational barrier of the NC bond in the diacetyl derivative, of 23±2K.Cal/mol. |
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