1H and 13C NMR spectral study of some 3-aryl-5r-aryl-6t-carbethoxycyclohex-2-enones-a study of four-bond 1H-1H couplings |
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Authors: | Yuvaraj C Pandiarajan K |
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Institution: | Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamil Nadu, India |
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Abstract: | Nine 3-aryl-5r-aryl-6t-carbethoxycyclohex-2-enones 2a-2i have been synthesized. For all these compounds, (1)H and (13)C NMR spectra have been recorded. For two compounds, 2D spectra have been recorded. The spectral data suggest that these compounds adopt sofa conformation in solution with H-5, H-6 and H-4t occupying axial-like positions and H-4c occupying equatorial-like positions. In 3-phenyl-5r-(o-chlorophenyl)-6t-carbethoxycylohex-2-enone (2b), the o-chlorophenyl group is oriented such that the chlorine atom is in between H-4c and H-5. Allylic coupling of H-2 is observed only with H-4t. Evidence has been obtained for four-bond coupling between 1,3-diaxial and 1,3-axial-equatorial protons. |
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Keywords: | cyclohex‐2‐enones 1H NMR 13C NMR four‐bond 1H?1H coupling |
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