ORGANIC CHEMISTRY-STUD.SOLNS.MAN+SG(LL)
ORGANIC CHEMISTRY-STUD.SOLNS.MAN+SG(LL)
4th Edition
ISBN: 9781119659587
Author: Klein
Publisher: WILEY
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Chapter 25, Problem 72PP
Interpretation Introduction

Interpretation:

N-terminal residue of a peptide need to be identified from the given PTH derivative.

Concept introduction:

Edman degradation is a chemical reaction where the N-terminus amino acid is removed when the peptide is treated with phenyl isothiocyanate followed by treatment with trifluoroacetic acid to form phenylthiohydantoin(PTH) derivative and peptide with one amino acid residue less than the starting peptide.  This method can be used to identify the sequence of the amino acid in peptide as only one amino acid is removed each time forming the PTH derivative.  The general scheme for Edman degradation can be shown as,

ORGANIC CHEMISTRY-STUD.SOLNS.MAN+SG(LL), Chapter 25, Problem 72PP

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Questions 4 and 5
For a titration of 40.00 mL of 0.0500 M oxalic acid H2C2O4 with 0.1000 M KOH, calculate the pH at each of the following volume of KOH used in the titration: 1) before the titration begin;2) 15 mL; 3) 20 mL; 4) 25 mL; 5) 40 mL; 6) 50 mL. Ka1 = 5.90×10^-2, Ka2 = 6.50×10^-5 for oxalic acid.
Predict the major organic product(s), if any, of the following reactions.  Assume all reagents are in excess unless otherwise indicated.

Chapter 25 Solutions

ORGANIC CHEMISTRY-STUD.SOLNS.MAN+SG(LL)

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