Curtius Rearrangement reaction / Organic Name reaction mechanism / Curtius reaction for amines

Curtius Rearrangement reaction Organic Name reaction mechanism Curtius reaction for amine preparation

The Curtius rearrangement, first defined by Theodor Curtius in 1885, is the thermal decomposition of an acyl azide to an isocyanate with loss of nitrogen gas.
The Curtius rearrangement is a versatile reaction in which a carboxylic acid can be converted to an isocyanate through acyl azide intermediate under mild conditions. The resulting stable isocyanate can then be readily transformed into a variety of amines and amine derivatives including urethanes and ureas.
In one variation called the Darapsky degradation, or Darapsky synthesis, a Curtius rearrangement takes place as one of the steps in the conversion of an α-cyanoester to an amino acid. Hydrazine is used to convert the ester to an acylhydrazine, which is reacted with nitrous acid to give the acyl azide.

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[PraveenKumar-fpfy]

Sir, why In duration 3:15 1, 2 shift occurs?