IGNOU CHE 5 2018 - Write chemical reactions for the following:(i) Kolbe Schmidt react

Question

Write chemical reactions for the following:

(i) Kolbe Schmidt reaction

(ii) Strecker synthesis

(iii) Dieckmann cobndensation

(iv) Knoevenagel reaction

(v) Perkin condensation

25 Jan 2018

Answer :

Word Count : 398

The Kolbe–Schmitt reaction proceeds via the nucleophile addition of a phenoxide, classically sodium phenoxide (NaOC6H5), to carbon dioxide to give the salicylate. The final step is reaction of the salicylate with acid to form the desired salicylic

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The Strecker synthesis is a two-stage procedure used to synthesize alpha amino acids from aldehydes.

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Deprotonation of an ester at the α-position generates an enolate ion which then undergoes a 5-exo-trig nucleophilic attack to give a cyclic enol. Protonation with a Brønsted-Lowry acid (H3O+ for example) re-forms the β-keto ester.

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