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Abstract
Three new imperialine derivatives, i.e., 3-O-2-nitrophenylcarbamatoimperialine, 3-O-ethylaminocarbonylimperaline, and 3-O-allylaminocarbonylimperialine, were synthesized. The structures of the synthesized compounds were established using PMR and 13C NMR spectroscopy and a DEPT experiment and were confirmed by an X-ray crystal structure analysis (XSA). A comparison of the steric structures of imperialine and its 3-O-2-nitrophenyl and 3-O-ethylaminocarbonyl derivatives showed that H-bonds and crystal packing factors could cause conformational changes of the conditionally middle rings of the polycyclic imperialine framework.
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