- 21 Answer All Parts Of This Question A The Structure Shown Below Represents One Of The Stereoisomers Of The Amino Ac 1 (185.49 KiB) Viewed 42 times
21. Answer ALL parts of this question. (a) The structure shown below represents one of the stereoisomers of the amino ac
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21. Answer ALL parts of this question. (a) The structure shown below represents one of the stereoisomers of the amino ac
21. Answer ALL parts of this question. (a) The structure shown below represents one of the stereoisomers of the amino acid, cysteine: ÇOH С"Н HSCH NH2 Cysteine Assign priorities to of the four substituents attached to the chiral centre, using the rules proposed by Cahn, Ingold and Prelog. (4 marks) (b) Briefly explain how this order of priority may be used to define a particular enantiomer as either Ror S. Use the structure of cysteine shown above in part (a) to illustrate this, defining this structure as either Ror S. (3 marks) (c) The following represent three Newman projections of 1,2-dibromoethane. Identify the isomers as either anti-periplanar or gauche forms, and state which one(s) have the highest energy. Br H H H H H. Н. H H H H H Br Br H Br Br Br (3 marks)
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