N-C Axially Chiral Anilines Electronic Effect on Barrier to Rotation and A Remote Proton Brake

Abstract : N-Aryl-N-methyl-2-tert-butyl-6-methylaniline derivatives exhibit a rotationally stable N-C axially chiral structure and the rotational barriers around an N-C chiral axis increased with the increase in electron-withdrawing character of para-substituent on the aryl group. X-ray crystal structural analysis and the DFT calculation suggested that the considerable change of the rotational barriers by the electron effect of para-substituents is due to the disappearance of resonance stabilization energy caused by the twisting of para-substituted phenyl group in the transition state. This structural property of the N-C axially chiral anilines was employed to reveal a new acid-decelerated molecular rotor caused by the protonation at the remote position (remote proton brake).
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Yumiko Iwasaki, Ryuichi Morisawa, Satoshi Yokojima, Hiroshi Hasegawa, Christian Roussel, et al.. N-C Axially Chiral Anilines Electronic Effect on Barrier to Rotation and A Remote Proton Brake. Chemistry - A European Journal, Wiley-VCH Verlag, 2018, 24 (17), pp.4453-4458. ⟨10.1002/chem.201706115⟩. ⟨hal-01771098⟩

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