T. Fukai et T. Nomura, VARIATIONS IN THE CHEMICAL-SHIFT OF THE 5-HYDROXYL PROTON OF 7-O-PRENYLATED FLAVANONES, Heterocycles, 43(7), 1996, pp. 1361-1364
In H-1 nmr examination of 6- or 8-prenylated flavanone 7-methyl and 7-
prenyl ethers, the signals of hydrogen-bonded hydroxyl proton appeared
in relatively narrow region. Relatively large solvent effect was obse
rved on the signal of 6-prenylflavanone 7-methyl and 7-prenyl ethers.