1,1 -Binaphthalene-2,2 -dicarboxylic acids

Kano has studied extensively the recognition of anions and zwitterions by both native and derivatized cyclodextrins [ 16]. The native (3-cyclodextrin com-plexation properties were examined with respect to binaphthyl derivatives. For both l,T-binaphthalene-2,2,-dicarboxylic acid and l,T-binaphthalene-2,2 -diol phosphate almost no chiral recognition was observed. The enantiomers of binaphthyl-2,2 -dicarboxylic acid were better distinguished using a per-O-methylated (3-cyclodextrin derivative in place of the native (3-cyclodextrin. 

Compounds with a zigzag structure along one axis can be obtained by the reaction of 2,2 -dihydroxy-l,l -binaphthalene-6,6 -dicarboxylic acid (6.51) with salts of manganese, copper, cobalt or cadmium. In these networks (6.52), hydrogen bonds between the ID zigzags play a fundamental role in the cohesion of the crystal. 

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