title: Challenge to detect 1,4-zwitterions spectroscopically in a ketene-alkene reaction.
abstract: The first example of direct spectroscopic detection of transient species, 1,4-zwitterions, generated in a ketene-alkene reaction is reported. Also, a striking result of the intervention of an unprecedented "1,4-zwitterion neutral dimer" is presented in a new mechanistic pathway; the ketene-alkene reaction gives the product cyclobutanone from the initial cycloadduct alpha-methyleneoxetane.
authors.affiliation: Department of Chemistry, Faculty of Science, Saitama University, Sakura-ku, Saitama 338-8570, Japan. machiguc@chem.saitama-u.ac.jp
authors.forename: Takahisa
authors.initials: T
authors.lastname: Machiguchi
authors.forename: Junko
authors.initials: J
authors.lastname: Okamoto
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Morita
authors.forename: Toshio
authors.initials: T
authors.lastname: Hasegawa
authors.forename: Shinichi
authors.initials: S
authors.lastname: Yamabe
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Minato