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Dear Jack,
The Curtius Rearrangement is the thermal decomposition of carboxylic azides to produce an isocyanate. These intermediates may be isolated, or their corresponding reaction or hydrolysis products may be obtained.
The reaction sequence - including subsequent reaction with water which leads to amines - is named the Curtius Reaction. This reaction is similar to the Schmidt Reaction with acids, differing in that the acyl azide in the present case is prepared from the acyl halide and an azide salt.
Preparation of azides:
Decomposition:
Reaction with water to the unstable carbamic acid derivative which will undergo spontaneous decarboxylation:
Isocyanates are versatile starting materials:
Isocyanates are also of high interest as monomers for polymerization work and in the derivatisation of biomacromolecules.
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