- 21 Answer All Parts Of This Question A The Structure Shown Below In Figure Q21 A Represents One Of The Stereoisomer 1 (125.24 KiB) Viewed 30 times
21. Answer ALL parts of this question. (a) The structure shown below in Figure Q21(a) represents one of the stereoisomer
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21. Answer ALL parts of this question. (a) The structure shown below in Figure Q21(a) represents one of the stereoisomer
21. Answer ALL parts of this question. (a) The structure shown below in Figure Q21(a) represents one of the stereoisomers of the amino acid, cysteine: COLH 1 HSCH H NH, Figure Q21(a) Assign priorities to each 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) Three Newman projections of 1,2-dibromoethane are represented in Figure Q21(c). Identify the isomers as either anti-periplanar or gauche forms, and state which one(s) have the highest energy. Br H Н. H H Н. H H H H H H Br Br H Br Br Br Figure Q21(c)
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