title: Preparation of sterically congested di(4-pyridyl)diazomethanes and characterization of triplet carbenes from them.
abstract: Di(4-pyridyl)diazomethanes having two and four ortho chlorine groups were prepared, and the triplet carbenes generated from them were characterized by ESR and UV/vis at low temperature and time-resolved UV/vis at room temperature. An appreciable increase in the stability of triplet carbenes is achieved by introducing ortho chlorine groups. [structure: see text]
authors.affiliation: Chemistry Department for Materials, Faculty of Engineering, Mie University, Tsu, Mie 514-8507, Japan.
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Itoh
authors.forename: Akira
authors.initials: A
authors.lastname: Takada
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Hirai
authors.forename: Hideo
authors.initials: H
authors.lastname: Tomioka