Abstract
Thermal stabilities of N-(4-nitrophenylthio)-N-(4-tert-butyl-2,6-diphenylphenyl)aminyl 1a, N-(4-nitrophenylthio)-N-(2,4,6-triphenylphenyl)aminyl 2a, N-(2,4-dichlorophenylthio)-N-2,4,6-triphenylphenyl)aminyl 2b and N-(4-nitrophenylthio)-N-(2-tert-butyl-4,6-diphenylphenyl)aminyl 3a have been studied. When 1a, 2a and 2b are heated in degassed benzene at 80 °C for 24–30 h, they almost completely decompose, giving two non-radical compounds. On the other hand, 3a is thermally much more stable and the complete decomposition requires heating for 8 days. On the basis of the product analysis study the thermal decomposition mechanism is proposed and the reason why 3a is so stable at high temperature is discussed.
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