Preparation of sterically congested di(4-pyridyl)diazomethanes and characterization of triplet carbenes from them.
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]
Itoh
Tetsuji
T
Chemistry Department for Materials, Faculty of Engineering, Mie University, Tsu, Mie 514-8507, Japan.
Takada
Akira
A
Hirai
Katsuyuki
K
Tomioka
Hideo
H