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Chapter 5: Q56 E_b. (page 148)

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

(a)

(b)

Short Answer

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(b)

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01

Re or Si face

There are two planar faces in a compound, with a prochiral hybridized group designated Re and Si faces.The 鈥楻e鈥� face is clockwise, and the 鈥楽i鈥� face is anticlockwise. The Si face can be obtained by flipping the molecule.

02

The faces in the crotonate molecule

(b) According to C.I.P. sequence order, 鈥楻e鈥� face is given to the lower planar face, which is clockwise. 鈥楽i鈥� face is given to the upper planar face, which is anticlockwise.


Re and Si faces in crotonate

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