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The triflic acid (CF 3 SO 3 H) promoted cyclizations of 2-styrylbiaryls are found to be useful for the synthesis of polycyclic aromatic compounds, including functionalized derivatives of polycyclic aromatic compounds and heterocyclic systems. The reaction involves cationic cyclization followed by an elimination of benzene from the intermediate product.
Pyrazolecarboxaldehydes react in the Brønsted superacid triflic acid (CF 3 SO 3 H, TfOH) to generate electrophilic intermediates capable of reacting with benzene in condensation reactions. Appropriately substituted pyrazoles may also undergo intramolecular Friedel–Crafts-type reactions. It is proposed that the pyrazolecarboxaldehydes and related systems form diprotonated intermediates...
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