By use of photochemical syntheses, TaIV and TaVIII have been identified as 3-hydroxy-2,4-dimethoxy-7,8-methylenedioxyphenanthrene and 3,7-dihydroxy-2,4-dimethoxyphenanthrene, respectively; earlier assignments are thus shown to be incorrect.
R. M. Letcher and K. Wong, J. Chem. Soc., Perkin Trans. 1, 1979, 2449 DOI: 10.1039/P19790002449
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