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Benzotriazole-mediated indirect electrophilic substitution in the position para to the oxygen atom of benzo[b]pyrylium salts has been used for the synthesis of long-chain and bifunctional benzo[b]pyrylium species. The methodology has potential for application in high technology and the pharmaceutical industries, for the molecular engineering of new functionalized derivatives.
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Katritzky et al. (1998) studied this question.
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