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Synthesis and Characterization of the Furo and Thieno Analogues of the Triester of PQQ We report here the synthesis and properties of the furo and thieno analogues of 4,5‐dihydro‐4,5‐dioxo‐1H‐pyrrolo[2,3‐f]quinoline‐2,7,9‐ tricarboxylic acid ( = PQQ), i.e. the furo‐ and thieno[2,3‐f]quinoline‐4,5‐quinone (FQQ and TQQ, resp.) derivatives B and C, obtained as triesters. The triester of PQQ derivative A is much more stable than the triesters of B or C, and only the triester of A shows strong activity in nonenzymatic catalytic oxidations.
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Martin et al. (1994) studied this question.
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