- Concerning the Question of Covalent Bonding in Hypericin-Chromoproteins: Schiff Base Formation?
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Depending on the reaction conditions, peri-hydroxy substituted anthraquinones like 1,8-dihydroxyanthraquinone and 1,4-dihydroxyanthraquinone could be derivatized with ammonia, propylamine, isopropylamine, and a lysine derivative to yield a variety of imino and amino substitution and addition products.However, hypericin resisted such derivatization under a variety of reaction conditions.Therefore, the hypothesis that hypericin is bound to its apoprotein in photopigments via a Schiff base to the ε-amino group of a lysine residue or a terminal amino group seems to be rather unlikely. - Keywords.Hypericin; Stentor; Schiff base; Anthraquinone imines; Aminoanthraquinones.
- Falk, H.,Mueller, N.,Oberreiter, M.
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- Phase transfer catalysed N-monoalkylation of amino anthraquinones
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1-Alkylaminoanthraquinones (2a-f) and 1,4-bisalkylaminoanthraquinones (4a-c) were prepared from aminoanthraquinones (1,3) by alkylation with alkyl sulphate/alkyl halide in presence of powdered sodium hydroxide, potassium carbonate and phase transfer catalyst.
- Ramrao,Ramkumar,Anant,Ramanuja
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p. 1129 - 1135
(2007/10/02)
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