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Obituary
Franco Piozzi (1928-2022)
Franco Piozzi (1928-2022)
Professor Franco Piozzi,
a member of the Honorary Advisors to the Editorial Board of HETEROCYCLES,
has passed away on February 13, 2022 at the age of 93.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
March 4, 2022
Extension of the deadline by February 20, 2022
Call for Contributions
HETEROCYCLES Special Issue Vol. 105 in honor of Professor Somsak Ruchirawat on 80th Birthday
HETEROCYCLES Special Issue Vol. 105 in honor of Professor Somsak Ruchirawat on 80th Birthday
Submission deadline: December 20, 2021
On the occasion of Professor Somsak Ruchirawat's 80th birthday, HETEROCYCLES editorial office is planning to publish special anniversary issue on June 28, 2022 as Vol. 105. Authors are invited to submit their work to this topical issue.
Authors wishing to submit their manuscript should contact editorial office via e-mail by April 26, 2021. Manuscript should reach the editorial office no later than December 20, 2021.
Contact: submit@heterocycles.com
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February 22, 2021
Dear Authors,
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May 12, 2021
I think you are in the middle of fighting COVID-19.
Concerned about the difficulty of carrying out your research due to the influence of COVID-19, we decided to extend the deadline for the commemorative issue to celebrate Professor Somsak Ruchirawat's 80 years old.
We would like to extend the deadline by February 20, 2022.
Please submit your manuscript by that time.
I pray for overcoming COVID-19.
Kunio Ogasawara
Editor
May 12, 2021
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Report | Regular issue | Vol 23, No. 1, 1985, pp.153-157
Published online, 1st January, 1970■ 2,6-Dimethyl-3-cyano-4-thioxothiopyran and Related Molecules from Enaminonitriles and Hydrogen Sulfide by Phase Transfer Catalysis
Published online, 1st January, 1970
DOI: 10.3987/R-1985-01-0153
■ 2,6-Dimethyl-3-cyano-4-thioxothiopyran and Related Molecules from Enaminonitriles and Hydrogen Sulfide by Phase Transfer Catalysis
Jean-Pierre Roggero,* Serge Coen, Bernard Ragonnet, and Catherine Viellescazes
*Faculté des Sciences, Laboratorie de Chimie Organique, 33, rue Louis Pasteur, 84000 Avignon, France
Abstract
3-Aminocrotonitrile reacts with H2S in the presence of a phase transfer catalyst to yield 2,6-dimethyl-3-cyano-4-thioxothiopyran (liquid-solid catalysis) or the 4-oxo homolog (liquid-liquid catalysis). In the absence of hydrogen sulfide, 2,6-dimethyl-3-cyano-4-pyrone is obtained. The reaction mechanism is discussed.
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