assign the R** he R or S designation to each enter by number in The follawing...

Question

Question

assign the R**
he R or S designation to each enter by number in The follawing projechone 1CH2 1CH3 F ce CH3 di stinguish thellowing paunds,

science chemistry

Answer 1

Answer #1

a) there is no chiral center, hence there will be no R and S assignment.

b ) 2nd and 3rd carbon are chiral centers.

This is a Fischer projection, hence all vertical bonds are going away from the viewer and all horizontal bonds are coming towards the viewer.

Priority order at C2: F > C(Cl,Br) > CH3 > H

The eyesight moves in the clockwise direction but the lowest priority group is not going away from the viewer. Hence the configuration is "S".

Now priority order at C3: Br > Cl > CHF > CH3

The eyesight moves in clockwise direction and lowest priority group CH3 is going away from the viewer. Hence, configuration is "R".

Please note that I am using your numbering as shown in the question and this numbering is not as per the IUPAC system.

c) In this compound the C3 is a chiral center.

Priority order at C3: OH > COOH > CH2 > H

Eyesight moves in the anticlockwise direction. But lowest priority group is not going away from the viewer. Hence the configuration is R.

d) H- C- F Br COOH HOH HH ci, BreH ../ HH E (2R,3S)-2-bromo-2-chloro-3-fluorobutane (2R)-2-hydroxybutanoic acid (2R,3S)-2-bromo

Answer 2

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