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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 | Regular issue | Vol 29, No. 12, 1989, pp.2345-2351
Published online, 1st January, 1970■ The Skraup Reaction of 3,4-Dihydroanilines
Published online, 1st January, 1970
DOI: 10.3987/COM-89-5122
■ The Skraup Reaction of 3,4-Dihydroanilines
Richard A. Blatchly, Michael A. Greeley, and J. Hodge Markgraf*
*Department of Chemistry, Williams College, 47 Lab Campus Drive, Williamstown, MA 01267, U.S.A.
Abstract
Six 3,4-dithaloanilines (1) were converted by the sulfo-mix variation of the Skrap reaction to mixtures of 5,6- and 6,7-dihaloquinolines, 2 and 3 respectively. Inductive effects were the dominant influence on the course of cyclization: the more highly electronwithdrawing the substituents of 1, the greater was the proportion of 3. Steric effects were absent.
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