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Structural characterization of the crystalline diastereomeric complexes of enantiopure dimethylacridino-18-crown-6 ether and the enantiomers of 1-(1-naphthyl)ethylamine hydrogen perchlorate

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Abstract

This paper describes the X-ray crystal structure of the diastereomeric complexes formed by enantiopure dimethyl-substituted acridino-18-crown-6 ether (R,R)-1 and the enantiomers of 1-(1-naphthyl)ethylammonium perchlorate. We found that the heterochiral complex (R,R)-1–(S)-1-NEA is more stable than the homochiral one (R,R)-1–(R)-1-NEA. In the case of the heterochiral complex, the X-ray studies revealed a strong intermolecular ππ interaction between the naphthyl unit and the acridine moiety. However, in the case of the homochiral complex, ππ interaction was not found. We suggest that the existence or absence of the ππ interaction and the difference in steric repulsions in the diastereomers is responsible for the enantiomeric discrimination.

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Acknowledgments

Financial supports of the Hungarian Scientific Research Fund (OTKA K112289, K109486 and NK84008), the CRP/HUN14-01 ICGEB Research Grant, the New Széchenyi Development Plan (TÁMOP-4.2.1/B-09/1/KMR-2010-0002) and the Pro Progressio Foundation are gratefully acknowledged.

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Correspondence to Péter Huszthy.

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Dedicated to Professor George A. Oláh on the occasion of his 90th birthday.

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Tóth, T., Németh, T., Leveles, I. et al. Structural characterization of the crystalline diastereomeric complexes of enantiopure dimethylacridino-18-crown-6 ether and the enantiomers of 1-(1-naphthyl)ethylamine hydrogen perchlorate. Struct Chem 28, 289–296 (2017). https://doi.org/10.1007/s11224-016-0818-6

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  • DOI: https://doi.org/10.1007/s11224-016-0818-6

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