Total and unambiguous assignment of the1H NMR spectrum of piperovatine [6‒(4‒methoxyphenyl)‒N‒(2‒methylpropyl)‒2,4‒hexadienamide] was carried out using conventional 1D NMR methods and spectral spin–spin simulation. Based on these data, the complete assignment of the13C NMR chemical shift values was made by a13C/1H chemical shift correlation diagram and conventional considerations for the quaternary carbon atom.
En el presente trabajo se describe el aislamiento y caracterización de neoxantina obtenida en la parte aérea de la especie vegetal Inga ingoides colectada en la localidad de Coroico del Departamento de La Paz, Bolivia. La planta fue sometida a procesos de extracción y de cromatografía en columna sobre silica gel, con fase móvil de éter de petróleo/acetato de etilo de gradiente polar creciente. La fracción mayoritaria de cromatografía de coloración rojiza obtenida, fue sometida a cromatografía líquida de alta resolución acoplada a espectrometría de masas HPLC_MS determinándose la presencia de neoxantina.
Four 1-(3,4-methylenedioxyphenyl)-alkanes having linear ten, eleven, twelve and fourteen carbon atom chains, found in the roots ofPiper darienenceD.C., were separated by HPLC and their structures determined by mass spectrometry and NMR spectroscopy. Conventional 1D NMR methods were used for1H chemical shifts assignment of the main compound dihydropipataline (3) [1-(3,4-methylenedioxyphenyl)‒dodecane]. The13C NMR assignment was carried out using conventional considerations and 2D NMR techniques (HETCOR and FLOCK) in combination with spectral13C NMR simulation andab initioDFT-GIAO NMR calculations.
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