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Curtius rearrangement is an important organic reaction in which an acyl azide undergoes thermal decomposition to produce an isocyanate with the elimination of nitrogen gas. This reaction is widely used for the synthesis of primary amines, carbamates, and ureas. The process begins with the preparation of an acyl azide, which can be obtained from an acyl chloride by treatment with sodium azide in an appropriate solvent. Upon heating, _______ ___ _______ _____ _______ _____ ______ ________ ______ ____ _________.
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