Since $\ce{-CN}$ shows strong $\ce{-I}$ effect, there will be $\delta +ve$ charge on the carbon adjacent to it. Similarly, $\ce{-NO2}$ shows strong $\ce{-I}$ and $\ce{-M}$ effects.
So I this is my attempt: $\pi$ electrons are being donated to the electron deficient parts.
But the answ...
Why is the basicity of para- > meta- > aniline > ortho-
for phenylenediamine?
($\mathrm pK_\mathrm a$: ortho: 9.53, meta: 9.12, para: 7.96) I tried deducing it using resonance and inductive effects but got stuck.
The Curtius rearrangement (or Curtius reaction or Curtius degradation), first defined by Theodor Curtius in 1885, is the thermal decomposition of an acyl azide to an isocyanate with loss of nitrogen gas. The isocyanate then undergoes attack by a variety of nucleophiles such as water, alcohols and amines, to yield a primary amine, carbamate or urea derivative respectively. Several reviews have been published.
== Preparation of acyl azide ==
The acyl azide is usually made from the reaction of acid chlorides or anydrides with sodium azide or trimethylsilyl azide. Acyl azides are also obtained from...
