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Freezing Conformation of Polychloronitrophenyl N-Substituted Morpholines Studied by DNMR and X-Ray Crystal Structure

The acceleration of SNAr reaction of aromatic halides has been studied with various amines under high pressure. Compounds having high steric hindrance as 2-morpholino-substituted polychloro-1-nitrobenzenes were obtained. These showed different behaviours of methylene protons of morphlino ring at room temperature apparently related to the higher steric hindrance. So these compounds were investigated using dynamic 1H NMR and single crystal X-ray crystallography.