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The synthesis of azepine using ethoxycarbonyl nitrene involves the generation of a reactive nitrene intermediate from an appropriate precursor, typically an azidoformate such as ethyl azidoformate. Ethoxycarbonyl nitrene is a highly reactive species characterized by a divalent nitrogen atom with a lone pair and an empty orbital, making it electrophilic ______ ___ _________ ________ ____ ____ _______ ________ __________ _________.
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