Enantiodifferentiation of carboxylates by chiral building blocks for abiotic anion receptors

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Abstract
The chiral bicyclic guanidinium compound (2b) binds oxoanionic guests by a unique ion pairing pattern, which is confirmed by the X-ray crystal structure of the nitrate salt (2S, 8S)-2,8-bis(t-butyldiphenylsilyloxymethyl)-3,4,6,7,8,9-hexahydro-2H-pyrimido[1,2a]pyrimidine hydronitrate, and allows enantiodifferentiation of racemic carboxylic acids by NMR.