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Based on m ‐terphenyl units, concave benzoic acids 11a and 12a were prepared via the 2,6‐diarylbenzoic acid 7a . Bromination of 7a with NBS gave 9 , and cyclization of 9 with dithiols 10 led to the bimacrocyclic concave acids 11a and 12a . Their relative acidities were determined by photometric titrations in ethanol, and the three‐dimensional structure of 11a was determined by X‐ray analysis.
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Lüning et al. (1991) studied this question.
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