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Yoshito Kishi (1937-2023)
Yoshito Kishi (1937-2023)
Professor. Yoshito Kishi,
a member of the Honorary Editorial Associates of HETEROCYCLES,
has passed away on January 9, 2023 at the age of 85.
I deeply express my regret over his death.
Kunio Ogasawara
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January 13, 2023
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Paper | Regular issue | Vol 34, No. 6, 1992, pp.1213-1225
Published online, 1st January, 1970■ 1H Nmr Chemical Shift of the Flavonol 5-Hydroxy Proton as a Characterization of 6- or 8-Isoprenoid Substitution
Published online, 1st January, 1970
DOI: 10.3987/COM-92-6026
■ 1H Nmr Chemical Shift of the Flavonol 5-Hydroxy Proton as a Characterization of 6- or 8-Isoprenoid Substitution
Toshio Fukai and Taro Nomura*
*Faculty of Pharmaceutical Sciences, Toho University, 2-2-1, Miyama, Funabashi, Chiba 274, Japan
Abstract
1H Nmr examination of 6- or 8-isoprenoid substituted flavonols has shown that the location of isoprenoid side chain on A ring can be deduced from the chemical shift of the 5-hydroxy proton. The application of this 1H nmr technique to identification of the isoprenoid substituted flavonols is discussed. The proposed structures for glepidotin A and two flavonols were revised with this method as well as chemical method.
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