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Benzotriazole can be synthesised from ortho-phenylenediamine through a diazotization–cyclisation reaction involving nitrous acid. In this method, ortho-phenylenediamine is treated with sodium nitrite and a mineral acid such as hydrochloric acid at low temperature, typically between 0–5 °C, to generate nitrous acid in situ. One of the amino groups ______ ___ ____ _________ ___ __________ ____ ________ __________ _____ _______ _____.
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