Naphthoquinones

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Abstract

About 200 new naphthoquinones have been isolated in the last decade from plants, animals and micro-organisms, and whereas formerly sea urchins were the only marine source of these pigments they are now known to occur in hydroids, algae, sponges and marine fungi. o-Naphthoquinones continue to be of rare occurrence, outwith the sesquiterpenoid group, but meroterpenoid naphthoquinones are increasingly common. Pigments of particular interest are tectograndisone in which an anthraquinone unit is linked to a naphthoquinone, and the kinamycin group, formerly regarded as benzocarbazolequinones, which are now known to be derivatives of diazobenzofluorene.