4.T) The article says that theaspartic acid residues werederivatized with ophthaldialdehydebefore HPLC analysis. Draw thestructure of the product of thereaction between D-aspartic acidand ophthaldialdehyde at pH 7. (Aldehydes react with amines.)

Key Points to Consider:Aspartic Acid: It is an amino acid with both an amino group (-NH₂) and a…

Answered: 4. T) The article says that the…

Chemistry for Today: General, Organic, and Biochemistry

9th Edition

ISBN:9781305960060

Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen

Publisher:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen

Chapter15: Carboxylic Acids And Esters

Section: Chapter Questions

Problem 15.55E

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CH,OCH,CI SnCl, CH,CI The chloromethylated polystyrene resin used for Merrifield solid-phase peptide synthesis is prepared by treatment of polystyrene with chloromethylmethyl ether and a Lewis acid catalyst. The reaction involves the following steps: 1. Reaction of the ether with the Lewis acid to form cation 1; 2. Electrophilic aromatic substitution to form resonance stzbilized cation 2: 3. Deprotonation yields aromatic ether 3: 4. Protonation to žorm protonated ether 4; 5. Displacement by chloride ion to form the final product Write out the mechanism on a separate sheet of paper and then draw the structure of the resonance contributors of the resonance stabilized cation 2. • Use Rl groups to indicate the points where the polymer repeats. The R group tool is located in the charges and lone pairs drop-down menu. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate resonance structures using the symbol from the…
Mm.22. Subject :- Chemistry
Lithium borohydride (LiBH4) is a useful reducing agent, as it is more selective than LIAIH4 but less selective than NaBH4. Specifically, LiBH4 will reduce esters, but it will not reduce amides. This selectivity is frequently employed by synthetic organic chemists. For example, during a synthesis of (-)-croalbinecine, a natural product with cytotoxic properties, compound 1 was converted to compound 3, as shown below (J. Org. Chem. 2000, 65, 9249-9251). Draw the structures of 2 and 3. CO₂Et но- 1 -N Ph 1) Excess LiBH4 2) H₂O OCH 3 2 1) Excess NaH, excess PhCH₂Br, DMF 2) H₂, Lindlar's catalyst 3
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6. The reaction between aniline and nitrous acid at low temperature yields A) an N-nitroso amine B) a diazonium salt C) a nitrile D) an amine nitrite salt 7. An organic nitrogen compound, X, gives ammonia on warming with dilute aqueous sodium hydroxide, X could be A) ethanamide B) ethylamine C) phenylamine D) amino ethanoic acid
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4. T) The article says that the aspartic acid residues were derivatized with ophthaldialdehyde before HPLC analysis. Draw the structure of the product of the reaction between D-aspartic acid and ophthaldialdehyde at pH 7. ( Aldehydes react with amines.)