Konfiguration und Konformation heterocyclischer β -Ketodicarbonsäureester und ihrer Reduktionsprodukte

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Abstract
The configurations and conformations of alkyl 2,6-diaryl piperidone 3,5-dicarboxylates and of alkyl 2,6-diaryl 1-oxa-(and 1-thia-)cyclohexanone 3,5-dicarboxylates have been studied by proton resonance spectroscopy. The preferred conformation of the ketones is the chair conformation in which the aryl and the alkoxycarbonyl substituents have equatorial positions. Reduction of these compounds with sodium borohydride yields two epimeric alcohols. The configurations at C-4 of these epimers were deduced from the p.r. spectra.

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