4-dodecylbenzenesulfonic acid (dbsa) as an efficient and recyclable catalyst for synthesis of 14-aryl- and 14-alkyl-14-h-dibenzo [a,j]xanthenes under solvent-free conditions
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abstract
14-aryl- and 14-alkyl-14-h-dibenzo [a,j]xanthenes are prepared from the reaction of aromatic- and aliphaticaldehydes with β-naphthol in the presence of catalytic amounts of 4-dodecylbenzenesulfonic acid(dbsa) as asurfactant-type brønsted acid catalyst in toluene and under solvent-free conditions in excellent yields and shortreaction times. the catalyst was recovered and reused for five successive times without considerable loss in itsactivity.
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Journal title:
iranian journal of science and technology (sciences)ISSN 1028-6276
volume 37
issue 1 2013
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