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The synthesis of azepine using ethoxycarbonyl nitrene involves a nitrene insertion reaction, which is an important method for constructing seven-membered nitrogen-containing heterocycles. Ethoxycarbonyl nitrene is generated from precursors such as ethyl azidoformate (EtO–CO–N₃) under thermal or photolytic conditions. Upon heating or photolysis, the azide group decomposes, _______ ______ _____ ___ ______ _________ ____ ___ ______ ____ ______.
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