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Carbon-13 NMR spectra of isomers of four mono-and three diisopropyldibenzofurans were recorded by an NMR spectrometer with a magnet of 9.4 T (or 400 MHz type). Even if the sample was a mixture of components or was of only 50% purity, unequivocal assignments were obtained by means of carbon-proton correlated spectroscopy (C-H COSY). Based on the a-effect by isopropyl group, and with the assistance of quaternary spectra (QUAT), one of diisop.ropyldibenzofurans was determined to be 2,4-isomer, anddoi:10.2116/analsci.7.843 fatcat:xnaf7jwzkfei7jo7eorpadx7na