An extremely long-lived singlet 4,4-dimethoxy-3,5-diphenylpyrazolidine-3,5-diyl derivative: a notable nitrogen-atom effect on intra- and intermolecular reactivity
Department of Applied Chemistry, Graduate School of Engineering, Osaka University (HANDAI), 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan. abe@chem.eng.osaka-u.ac.jp