NAME 1. Vitamin Ds, cholecalciferol, is synthesized under the skin by the photoc
ID: 548685 • Letter: N
Question
NAME 1. Vitamin Ds, cholecalciferol, is synthesized under the skin by the photochemical pericyclic process shown below. Answer the following questions about these reactions. CH hv CH2 HO HO OH 7-Dehydrocholesterol Cholecalciferol (Vitamin Dy) I. The first step in this process is a(n) a. sigmatropic rearrangement c. annulation reaction b. cycloaddition reaction d. electrocyclic reaction Il. The second step in this process is a(n): a. sigmatropic rearrangementb. cycloaddition reaction c. annulation reaction d. electrocyclic reaction 2. Consider the reaction below to answer the following questions: I. Has this reaction taken place in a conrotatory manner or in a disrotatory manner? a. conrotatory Under what conditions, thermal or photochemica b. disrotatory Il. I, would you carry out this reaction? Explain.Explanation / Answer
Answer 1 (I) d. The first Step in this process is Electrocyclic reaction
Answer 1 (II) a. The first Step in this process is Sigmatropic rearrangement
Answer 2 (I) b. Disrotatory
(II) Under thermal Condition the reaction will carry out
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