An efficient and straightforward procedure for the synthesis of 14-alkyl or aryl-14-H-dibenzo[a,j]xanthenes has been achieved through the one-pot condensation of β-naphthol with alkyl or aryl aldehydes in the presence of p-toluene sulfonic acid as catalyst under two conditions: organic solvent and solvent-free media.
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Khosropour et al. (2005) studied this question.
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