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Chapter 24: Q17P. (page 1273)

Use resonance forms to show delocalization of the negative charge in Ruhemann鈥檚 purple anion.

Short Answer

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Formation of Ruhemann鈥檚 purple anion

Resonance form of Ruhemann鈥檚 purple anion

Step by step solution

01

Formation of Ruhemann’s purple anion

When ninhydrin reacts with an amino acid, the product formed is a deep violet resonance-stabilized anion known as Ruhemann鈥檚 purple. The reaction of an amino acid with ninhydrin is shown below:

Formation of Ruhemann鈥檚 purple anion

02

Resonance form of Ruhemann’s purple anion

The resonance form of Ruhemann鈥檚 purple anion is as shown below:

Resonance form of Ruhemann鈥檚 purple anion

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Most popular questions from this chapter

The following structure is drawn in an unconventional manner.

(a) Label the N terminus and the C terminus.

(b) Label the peptide bonds.

(c) Identify and label each amino acid present.

(d) Give the full name and the abbreviated name

Suggest a method for the synthesis of the natural L enantiomer of alanine from the readily available L enantiomer of lactic acid.

Show the steps and intermediates in the synthesis of Leu-Ala-Phe by the solid-phase process.

Draw the complete structures of the following peptides:

(a) Thr-Phe-Met (b) Serylarginylglycylphenylalanine (c) IMQDK (d) ELVIS

Question. Propose a mechanism for the coupling of acetic acid and aniline using DCC as a coupling agent.

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