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Obituary
Zenichi Yoshida (1925-2023)
Zenichi Yoshida (1925-2023)
Professor. Zenichi Yoshida,
a member of the Honorary Advisors of HETEROCYCLES (1975-1998),
has passed away on May 4, 2023 at the age of 97.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
May 11, 2023
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Paper | Regular issue | Vol 48, No. 11, 1998, pp.2245-2251
Published online, 1st January, 1970■ Improved Procedures for Direct Conversions of Natural 3β-Hydroxy-gibberellins to 3α-Hydroxy-and 3-Oxo-gibberellins
Published online, 1st January, 1970
DOI: 10.3987/COM-98-8288
■ Improved Procedures for Direct Conversions of Natural 3β-Hydroxy-gibberellins to 3α-Hydroxy-and 3-Oxo-gibberellins
Hideharu Seto,* Shozo Fujioka, Yuji Kamiya, and Shigeo Yoshida
*The Institute of Physical and Chemical Research, Wako-shi, Saitama 351-0198, Japan
Abstract
Natural 3β-hydroxy-gibberellins, GA3 (gibberellic acid) (1), GA1 (2), and GA4 (3), were directly converted to 3α-hydroxy-gibberellins, 3-epi-GA3 (4), -GA1 (5) and -GA4 (6), by highly α-biased equilibration through retro- and realdol mechanism with potassium tert-butoxide in tert-butyl alcohol, and to 3-oxo-gibberellins, 3-oxo-GA95 (7), -GA20 (8) and -GA9 (9), by catalytic oxidation with tetrapropylammonium perruthenate.
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