A joint X-ray single-crystal and conformational (molecular mechanics) study has been carried out on several hydrogenated triptycene stereoisomers. The calculated and observed geometries compare quite satisfactorily. In particular the lowest-energy conformation of the cyclohexane rings cis-attached to the bicyclo-octane cage always coincides with the unusual boat-conformation. The free energy of the most stable perhydrotriptycene stereoisomers in the gaseous state, calculated neglecting vibrational entropy contribution, is also in good agreement with the equilibrium concentrations reached in solution after one month at 172 °C, in the presence of Pd/C catalyst.
Stereoisomers of hydrogenated triptycene: a joint crystallographic and conformation study of a set of strained hydrocarbon molecules / S. Bruckner, G. Allegra, A. Albinati, M. Farina. - In: JOURNAL OF THE CHEMICAL SOCIETY. PERKIN TRANSACTIONS 2. - ISSN 1472-779X. - 3(1980), pp. 523-529. [10.1039/p29800000523]
Stereoisomers of hydrogenated triptycene: a joint crystallographic and conformation study of a set of strained hydrocarbon molecules
A. AlbinatiPenultimo
;
1980
Abstract
A joint X-ray single-crystal and conformational (molecular mechanics) study has been carried out on several hydrogenated triptycene stereoisomers. The calculated and observed geometries compare quite satisfactorily. In particular the lowest-energy conformation of the cyclohexane rings cis-attached to the bicyclo-octane cage always coincides with the unusual boat-conformation. The free energy of the most stable perhydrotriptycene stereoisomers in the gaseous state, calculated neglecting vibrational entropy contribution, is also in good agreement with the equilibrium concentrations reached in solution after one month at 172 °C, in the presence of Pd/C catalyst.
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