Summary
The absorption spectra of dibenzanthrone, 16: 17-dihydroxydibenzanthrone, 16: 17-and 3: 12-dimethoxydibenzanthrone have been determined ino-chlorophenol. The bathochromic shift of the dibenzanthrone spectrum on substitution of two methoxyl groups in the 16: 17-positions of dibenzanthrone is ascribed to the over-riding tendency of the dibenzanthrone ring system to remain planar and hence force the methoxyl groups also to be coplanar with the ring system.
The absorption spectra of 3:3′- and 4:4′-dibenzanthronyls have been reported and discussed.
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Padhye, M.R., Rao, N.R. & Venkataraman, K. Anthraquinone and anthrone series. Proc. Indian Acad. Sci. (Math. Sci.) 38, 307–319 (1953). https://doi.org/10.1007/BF03045259
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DOI: https://doi.org/10.1007/BF03045259