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Chapter 5: Q5-56-E_a (page 148)

Identify the indicated faces in the following molecules as Re or Si:

Short Answer

Expert verified

In stereochemistry, prochirality is converting achiral compounds into chiral ones. There are two faces in prochirality, one is Re face, and the other is Si face.Re face is when priority groups are arranged clockwise, and Si face is when priority groups are arranged anticlockwise.

Step by step solution

01

Prochirality

In stereochemistry, prochirality is converting achiral compounds into chiral ones. There are two faces in prochirality, one is Re face, and the other is Si face.Re face is when priority groups are arranged clockwise, and Si face is when priority groups are arranged anticlockwise.

02

The faces in the pyruvate molecule

a) According to C.I.P. sequence order, Re face is when priority substitutents are arranged in clockwise order. When we turn over the molecule, the priority substituents become anticlockwise, this is Si face. The 鈥楻e鈥� face is given to upper planar face. Here, the carbonyl group is given 1st priority, followed by anion which is given 2nd priority, and the 3rd priority is given to group. The 鈥楽i鈥� face is given to lower planar face which is anticlockwise.

Re and Si faces in pyruvate

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