Question

What is aci form of nitro ethane? Discuss

Answer 1

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→ The Nef reaction is an organic reaction describing the acid hydrolysis of a salt of a primary $\stackrel{\text{or}}{a}$ secondary nitroalkane to an aldehyde $\stackrel{\text{or}}{b}$ a ketone and nitrous oxide.

→ Nitroalkanes, with $\alpha$-H can exhibit Tautomerism.

$$\begin{array}{c} \text{H} \\ \text{CH}_2-\text{N} \xrightarrow{\text{O}} \text{O} \\ \text{(neutral form)} \end{array} \quad \begin{array}{c} \text{H} \\ \text{CH}_2=\text{N}-\text{OH} - \text{form salts} \\ \text{with} \\ \text{NaOH} \\ \text{(aciform)} \end{array}$$

→ $\text{CH}_3-\text{CH}-\text{NO}_2$ also exhibits tautomerism

but not $\text{CH}_3-\text{C}-\text{NO}_2$, Here, the $\stackrel{\text{H}}{/}$

migrates to gnd atom and called Triad system

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