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Obituary
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
Editor
January 13, 2023
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Communication | Regular issue | Vol 20, No. 9, 1983, pp.1709-1712
Published online, 1st January, 1970■ Thio-Claisen Rearrangement of Troponoids
Published online, 1st January, 1970
DOI: 10.3987/R-1983-09-1709
■ Thio-Claisen Rearrangement of Troponoids
Hitoshi Takeshita, Kingo Uchida, and Hiroaki Mametsuka
*Instituete of Advanced Material Study, Kyushu University, 6-1, Kasuga-koen, Kasuga 816-8580, Japan
Abstract
Several 2-(allylthio)tropones and 2-(propargylthio)tropones gave 2,3-dihydro-(8H)-cyclohepta[b]thiophen-8-ones and (8H)-cyclohepta[b]thiophen-8-ones via a thio-Claisen rearrangement by heating above 180 °C. In cases of γ-substituted allyl derivatives, the results of rearrangement were poor; 2-(prenylthio)tropone gave isoprene by an elimination, similar to 2-(allyloxy)-tropones, while its 3,5,7-trimethyl homolog caused no reaction.
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