The hydroxy-o-terphenylcarboxylic acid esters 6a–f have been prepared by benzannulation of the 5,6-diaryl-3-methoxycarbonylhexa-3,5-dienoic acids 5a–f using triethylamine–ethyl chloroformate. The application of this new synthesis of triphenylenes is illustrated through the synthesis of 2-methoxycarbonyl-6,7,10,11-tetramethoxytriphenylene 9.
E. Brenna, C. Fuganti and S. Serra, J. Chem. Soc., Perkin Trans. 1, 1998, 901 DOI: 10.1039/A707738F
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