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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 89, No. 5, 2014, pp.1195-1202
Published online, 28th March, 2014
Published online, 28th March, 2014
DOI: 10.3987/COM-14-12968
■ Synethesis and Characterization of Di- and Tetrasubstituted p-tert-Butylthiacalix[4]arenes Containing Isatin Moiety at the Lower Rim
Siham Abd elrahman Lahsasni and Omran Abdellah Omran*
*Chemistry Department, Faculty of Science, Sohag University , Sohag 82524, Egypt
Abstract
Di- and tetrasubstituted p-tert-butylthiacalix[4]arene in three different conformers (cone, partial cone and 1,3-alternate) at lower rim, have been synthesized by the reaction of p-tert-butylthiacalix[4]arene and disubstituted p-tert-butylthiacalix[4]arene with isatin-3-[N2-(chloroacetyl)]hydrazone in acetone or acetonitrile in the presence of different alkali metal carbonates or hydroxide. Structures of the new compounds were established by elemental analyses and spectral data IR, 1H NMR, 13C NMR.
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