Chirality via meta Substitution

A and C rings, conferring C2 symmetry). The first experimental demonstration that calix[4]arenes of this type are chiral appeared in 1990 with 253c, which showed a doubling of the NMR patterns in the presence of a chiral shift 

Shinkai, S. Arimura, T. Kawabata, H. Murakami, H. Araki, K. Iwamoto, K. Matsuda, T. J. Chem. Soc., Chem. Commun. 1990, 1734, 

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