Add time:07/21/2019         Source:sciencedirect.com

The 1H, 13C and 15N NMR spectra of N-(2-hydroxyethyl)-morpholine (1), N-(2-hydroxyethyl)-morpholinium chloride (2), N-(2-hydroxyethyl)-morpholine betaine (3), N-morpholinyl-spiro-morpholactone chloride (4) and N-morpholinyl-spiro-morpholactone picrate (5) have been recorded and analyzed. The influence of protonation and N-alkylation of morpholine is discussed. The crystal structures of 4 and 5 have been determined by X-ray diffraction: 4 is orthorhombic, space group Pna21 and 5 is monoclinic, space group P21/c. The structure of 5 is well reproduced by the PM3 and SAM1 methods.

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