NMR assignments of unusual flavonoids from the kino of Eucalyptus citriodora.
Two unusual flavonoids, 3,5,4',5''-tetrahydroxy-7-methoxy-6-[1-(p-hydroxy-phenyl)ethyl]flavanone (1) and 3,5,7,4',5''-pentahydroxy-6-[1-(p-hydroxy-phenyl)ethyl] flavanone (2), were isolated from the kino of Eucalyptus citriodora. Structural elucidation of the new compounds were established on the basis of spectral data, particularly by the use of 1D NMR and several 2D shift-correlated NMR pulse sequences ((1)H, (1)H-COSY, HMQC, HMBC).
Freitas
Marinalva Oliveira
MO
Curso de Pós-Graduação em Química Orgânica, Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará, CP 12 200, Fortaleza-CE 60451-970, Brazil.
Lima
Mary Anne S
MA
Silveira
Edilberto R
ER
D002247:Carbon Isotopes; D003903:Deuterium; D005052:Eucalyptus / Q000737:chemistry*; D044950:Flavanones / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy / Q000379:methods* / Q000592:standards*; D008968:Molecular Conformation; D011522:Protons; D012015:Reference Standards; D012680:Sensitivity and Specificity; D013237:Stereoisomerism
C519647:3,5,4',5''-tetrahydroxy-7-methoxy-6-(1-(4-hydroxyphenyl)ethyl)flavanone; C519649:3,5,7,4',5''-pentahydroxy-6-(1-(4-hydroxyphenyl)ethyl)flavanone; D002247:Carbon Isotopes; D044950:Flavanones; D005419:Flavonoids; D011522:Protons; D003903:Deuterium