What is the main product of the following reaction? Assume excess of all reagent

Question

What is the main product of the following reaction? Assume excess of all reagents. The chemical in the ^13C NMR spectrum for this compound are 15.8, 40.1, 51.8, and 170.2. which correct set of chemical shifts for the carbon atoms? A peptide with 12 amino acids has the following amino acids:Asp, Cys, Cys, Glu, Glu, Leu, Leu, Ser, Ser, Tyr, Tyr, Val. At the N-terminal is Ser and at the C-terminal is Cys. Partial acid hydrolysis gave these peptide sequences:1. Ser-Leu-Tyr, 2. Tyr-Cys, 3. Leu-Tyr-Glu, 4. Glu-Leu-Glu, 5. Ser-Val-Cys, 6. Cys-ser-Val, 7. Glu-Asp-Tyr. What is the sequence of the original peptide? A. Ser-Val-Cys_Glu_Leu-Glu-Asp-Tyr-Ser-Leu-Tyr-Cys B. Ser-Val-Cys-Ser-Leu-Tyr-Glu-Leu-Glu-Asp-Tyr-Cys C. Ser-Leu-Tyr-Ser-Val-Cys-Glu-Leu-Glu-Asp-Tyr-Cys D. Ser-Leu-Tyr-Glu-Leu-Glu-Asp-Tyr-Cys-Ser-Val-Cys

Explanation / Answer

36. C, since formation of oxime follwed by oxidation

37. D, since CH3 crabon linked with Oxygen appears at 51.8ppm

38.D

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