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Phthalimide Reaction

Which of the ...

Question

Which of the following is the Fisher projection of $L -$ threonine (also known as $2 S, 3R - 2 -$ amino $-$ hydroxy butanoic acid)?

A

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B

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C

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D

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Solution

The correct option is D
For $C_{2}$ order of priority
$N H_{2} > C O O H > - C H (O H) C H_{3} > - H$
S, $2 S$
For $C_{3}$ order of priority
$- O H > - C H (N H_{2}) C O_{2} H > - C H_{3} > - H$
So $3 R$

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