The tertiary alcohol (3a) derived from 7-methyl-epi-nepenthone is converted into a C-4 phenol (4) by alkali and into a cyclopentenodihydrocodeinone (18) by mineral acid.
J. W. Lewis and M. J. Readhead, J. Chem. Soc. C, 1971, 2296 DOI: 10.1039/J39710002296
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