Kinetics of the Thermal Decomposition of 2,4,6-Triazido-3,5-Difluoropyridine

摘要: The kinetics and products of the thermal decomposition 2,4,6-triazido-3,5-difluoropyridine in melt at temperatures 120–160°C have been studied using pressure measurements, differential analysis, IR spectroscopy. reaction occurs two macroscopic steps, each described by a first-order kinetic equation. In first, activation energy common logarithm pre-exponential factor are 35.6 ± 1.2 kcal/mol 15.1 0.6 s–1, respectively. For compound (and certain other heterocyclic azides, such as 2,4,6-triazido-1,3,5-triazine 2,4,6-triazidopyrimidine), is anomalously high. This due to fact that molecule contains no hydrogen atoms. usual mechanism (cleavage azide group with subsequent attack nitrene on atom neighboring molecule) impossible, which favors stability formed nitrene. this case, through complex chain polymerization mechanism, leads formation specific condensed products: packs planar polyconjugate carbon–nitrogen networks porphyrin-like structure.