• Anthraquinone and anthrone series - Part XI. Steric hindrance in dibenzanthronyls and dibenzanthrones

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      https://www.ias.ac.in/article/fulltext/seca/038/04/0307-0319

    • Keywords

       

      Steric Hindrance; Anthraquinone; Bathochromic Shift; Substituent Group; Methoxyl Group

    • Abstract

       

      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.

    • Author Affiliations

       

      M R Padhye1 N R Rao1 K Venkataraman1

      1. Department of Chemical Technology, University of Bombay, India
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