| Résumé | The crystal structure of the hydrobromide of dl-betaprodine (beta dl-1,3-dimethyl-4-phenyl-4-propionoxypiperidine has been determined by the heavy-atom method from three-dimensional intensity data collected with a scintillation-counter diffractometer. The structure has been refined by three cycles of differential syntheses to an R-factor of 0-10, and the hydrogen atoms of the molecule of betaprodine have been located from a three-dimensional difference synthesis. In the betaprodine molecule the piperidine ring has the chair form with the phenyl ring quatorial and the propionoxy chain axial as in the alpha isomerm, but the methyl group of C(3) now is axial, instead of equatorial, and is cis to the phenyl ring on C(4).) |
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