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Obituary
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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Note | Regular issue | Vol 45, No. 10, 1997, pp.2033-2039
Published online, 1st January, 1970■ Regioisomers in the Photodimerization of Acridizinium Bromide
Published online, 1st January, 1970
DOI: 10.3987/COM-97-7891
■ Regioisomers in the Photodimerization of Acridizinium Bromide
Christoph Lehnberger, Dieter Scheller, and Thomas Wolff*
*Technische Universitat Dresden, Institut fur Physikalischce Chemie und Elektrochemie, Mommsenstr. 13, D-01062 Dresden, Germany
Abstract
Products of the photodimerization of acridizinium bromide (1) were analyzed by means of 1H NMR spectroscopy. Upon irradiation in solution and in the solid state four distinct isomeric photodimers were identified, two of which may exist in enantiomeric forms which could not be distinguished. Solubilization of 1 in anionic micellar solutions affected the regioselectivity of the photodimerization: as compared to a homogeneous aqueous solution the yield of dimers exhibiting higher dipole moments was enriched in the reaction mixture.
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