90460-16-5Relevant articles and documents
Heteropentalenes. The Thermal Addition of Pyrazolo- and Triazolobenzotriazoles to Dimethyl Acetylenedicarboxylate
Albini, Angelo,Bettinetti, Gianfranco,Minoli, Giovanna
, p. 2670 - 2676 (2007/10/02)
Pyrazolobenzotriazole (1a), 1,2,3-triazolobenzotriazole (1b), and 1,2,3-triazolobenzotriazole (1c) undergo electrophilic attack by dimethyl acetylenedicarboxylate to reversibly form diradical or zwitterionic intermediates, which then