The other three stereoisomers of l-isoleucine is to be drawn and the stereogenic centers are to be labeled as R or S . Concept introduction: The stereogenic centers with R , S configuration are assigned according to Cahn-Ingold-Prelog rules. According to these rules, the substituents attached to stereogenic centers are given priority. On moving from higher priority to lower priority substituent in clockwise direction, the compound is assigned with R configuration. On moving from higher priority to lower priority substituent in anticlockwise direction, the compound is assigned with S configuration.

Question

How many signals do you expect in the H NMR spectrum for this molecule? Br Br Write the answer below. Also, in each of the drawing areas below is a copy of the molecule, with Hs shown. In each copy, one of the H atoms is colored red. Highlight in red all other H atoms that would contribute to the same signal as the H already highlighted red. Note for advanced students: In this question, any multiplet is counted as one signal. Number of signals in the 'H NMR spectrum. For the molecule in the top drawing area, highlight in red any other H atoms that will contribute to the same signal as the H atom already highlighted red. If no other H atoms will contribute, check the box at right. No additional Hs to color in top molecule For the molecule in the bottom drawing area, highlight in red any other H atoms that will contribute to the same signal as the H atom already highlighted red. If no other H atoms will contribute, check the box at right. No additional Hs to color in bottom molecule

Answer 1

Question

Chapter 27.1, Problem 1P

Interpretation Introduction

Interpretation: The other three stereoisomers of l-isoleucine is to be drawn and the stereogenic centers are to be labeled as R or S.

Concept introduction: The stereogenic centers with R,S configuration are assigned according to Cahn-Ingold-Prelog rules. According to these rules, the substituents attached to stereogenic centers are given priority. On moving from higher priority to lower priority substituent in clockwise direction, the compound is assigned with R configuration. On moving from higher priority to lower priority substituent in anticlockwise direction, the compound is assigned with S configuration.

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