Depsidone

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The depsidones form the second largest group of aromatic lichen substances . The 11 H -dibenzo [ b, e ] [1,4] dioxepin-11-one forms its basic structure . This compound consists of two phenol nuclei linked by a -CO-O bridge and an ether bond . By dividing the lichen substances according to their biogenesis into four large groups, the depsidones are assigned to the acetyl-CoA derivatives. As of 1994 66 connections belong to the Depsidonen.

In addition to the predestined occurrence of depsidones in lichens , some have also been detected in fungi of the genera Aspergillus [ P.Micheli ex Link ] (watering can mold) and Preussia [ Preuss ].

Structural formula of 11H-dibenzo (b, e) (1,4) dioxepin-11-one

Representative

Well-known representatives are, for example: argopsin, diploicin, eriodermin, fumarprotocetraric acid , lobaric acid , norstictic acid , pannarin, physodic acid, psoromic acid, salacic acid and stictic acid.

biosynthesis

The biosynthesis of the depsidones in lichens probably proceeds via the structurally corresponding depsides . This is supported by the simultaneous occurrence of the pair of compounds olivetoric acid - physodic acid in the same genus ( Parmelia [ Ach. ]).

literature

  • Wolfgang Steglich, Burkhard Fugmann, Susanne Lang-Fugmann (eds.): RÖMPP Lexikon . Natural substances . 1st edition. Georg Thieme Verlag, Stuttgart / New York 1997, ISBN 3-13-749901-1

Individual evidence

  1. ↑ a b c d e Wolfgang Steglich, Burkhard Fugmann, Susanne Lang-Fugmann (eds.): RÖMPP Lexikon. Natural substances . 1st edition. Georg Thieme Verlag, Stuttgart / New York 1997, ISBN 3-13-749901-1 , p. 174 .
  2. ↑ Wolfgang Steglich, Burkhard Fugmann, Susanne Lang-Fugmann (eds.): RÖMPP Lexikon. Natural substances . 1st edition. Georg Thieme Verlag, Stuttgart / New York 1997, ISBN 3-13-749901-1 , p. 229 f .