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The gas phase additional mechanism of the photochemical reaction of pyridine leading to 2-chloropyridine, 3-chloropyridine and 4-chloropyridine has been theoretically studied by DFT B3LYP/3-21G∗. The results show that the energy of transition state for producing 2-chloropyridine is the lowest among three reaction pathways, and also the activation energy of resulting 2-chloropyridine is the lowest...
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