Reduction of colupulone (I) by zinc in acetic acid with and without hydrochloric acid has been studied. Five products [three benzodipyrans, (II), (III), and (V), and two chromans, (IV) and (VI)] are identified.
E. Byrne and S. J. Shaw, J. Chem. Soc. C, 1971, 950 DOI: 10.1039/J39710000950
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