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Stereomutations of Conformational Atropisomers of Hindered 1,2-Diaryltetrahydropyrimidines

✍ Scribed by M. Beatriz Garcia; Stefano Grilli; Lodovico Lunazzi; Andrea Mazzanti; Liliana R. Orelli

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
136 KB
Volume
2002
Category
Article
ISSN
1434-193X

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✦ Synopsis

The barriers required to interconvert the conformational enantiomers (atropisomers) of three 2-(o-halophenyl)-1-mesityl-1,4,5,6-tetrahydropyrimidines (the ortho-halogen substituents being I, Br, Cl) have been measured by low-temperature 1 H NMR spectroscopy. In addition, the barrier for the inversion of the heterocyclic six-membered ring has been determined by monitoring the 13 C NMR spectra at even lower [ ‡] Conformational Studies by Dynamic NMR, 92. Part 90: Ref. [1a] Part 91: Ref. [1b] [a]

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