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Trichloroisocyanuric acid (TCCA) reacts with arenes

Trichloroisocyanuric acid (TCCA) reacts with arenes and its reactivity is highly affected by the acid strength of the reaction medium. Deactivated arenes are efficiently chlorinated by TCCA in H2SO4. Our results, along with DFT calculations and 13C NMR spectrometry suggest the formation of a monoprotonated TCCA superelectrophile as the reactive species that can efficiently transfer electrophilic Cl+ to even very weak nucleophiles, such as m-dinitrobenzene.
Trichloroisocyanuric acid (TCCA) is safe, stable, and easily available reagent with high atom economy. 
Trichloroisocyanuric acid (TCCA) is monoprotonated by 98% H2SO4. 
DFT calculations support the formation of a superelectrophilic species.
TCCA in 98% H2SO4 can chlorinate arenes, even strongly deactivated substrates.
The reactivity of trichloroisocyanuric acid (TCCA) is regulated by the acid strength of the medium.
Which is better? trichloroisocyanuric acid (TCCA) or sodium hypochlorite? It can be analyzed by comparing characteristics:
Sodium hypochlorite:
For swimming pool disinfection it is mainly due to its strong oxidizing, thereby killing the bacteria. Its anti-virus effect than before with chlorine is better, but also more security. However, sodium hypochlorite is gradually phased out the reason, the main reasons are as follows: First, sodium hypochlorite is very unstable and difficult to save, it becomes less effective chlorine will change with the environment: temperature, humidity, light and storage time and other factors can lead to the effective chlorine gradually decreased, due to their attenuation particularly fast, not long-term storage site, and corrosive, so the storage and handling difficult. Second, when using the equipment demanding, difficult to maintain equipment, after using the pool pH rises a lot.