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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 | Special issue | Vol 40, No. 1, 1995, pp.401-411
Published online, 1st January, 1970■ Synthesis of Thiacrownophanes Exhibiting High Ag+ Selectivities on the Liquid-Liquid Extraction
Published online, 1st January, 1970
DOI: 10.3987/COM-94-S60
■ Synthesis of Thiacrownophanes Exhibiting High Ag+ Selectivities on the Liquid-Liquid Extraction
Seiichi Inokuma, Atsushi Kobayashi, Reiko Katoh, Toshiaki Yasuda, and Jun Nishimura
*Department of Chemistry, Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu 376-8515, Japan
Abstract
Thiacrownophanes (6-8) were prepared by means of intramolecular [2 + 2] photocycloaddition. Thiacrownophane (6) with two sulfur and three oxygen atoms showed the most efficient extractability toward Ag+ with high selectivity even if the extraction system did not contain any special lipophilic counter anion.
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