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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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Communication | Regular issue | Vol 41, No. 9, 1995, pp.1935-1938
Published online, 1st January, 1970■ Preparation of 2,4-Dialkylidene-1,3-dithietanes from Ynamines and Carbon Disulfide
Published online, 1st January, 1970
DOI: 10.3987/COM-95-7179
■ Preparation of 2,4-Dialkylidene-1,3-dithietanes from Ynamines and Carbon Disulfide
Isao Shibuya, Midori Goto, Akihiro Oishi, Tohru Tsuchiya, Yoichi Taguchi, and Juzo Nakayama
*National Institute of Materials and Chemical Research, 1-1 Higashi, Tsukuba, Ibaraki 305, Japan
Abstract
Aminoacetylenes R2N-C ≡ C-R’ (1) afforded 2,4-dialkylidene-1,3-dithietanes (2) on compressing or heating with carbon disulfied. The structure of 2 was determined by X-ray crystal structure analysis. Thiocarbamoylthioketenes, 1:1 adducts of the ynamine and carbon disulfide were proposed as the probable intermediates leading to 2. The present results indicate that the reactivities of ynamines toward carbon disulfide are different from those of electron-deficient acetylenes.
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