Consider the following compound [A]:

Question

Consider the following compound [A]: Which one of the following represents an enantiomer of [A]?

Vimal Swarnkar · Accepted Answer

(d) Fischer projection (d). [A] is (2S,3R)-2-bromo-3-methylpentane. Enantiomer must invert both centres → (2R,3S). Assigning CIP to options: (a) 2R,3R; (b) 2R,3R; (c) 2R,3R; (d) 2R,3S → (d). Trick: lowest priority (H) on a horizontal bond → reverse the observed sense.

Answer

(a) Fischer projection (a)

Answer

(b) Fischer projection (b)

Answer

(c) Fischer projection (c)

Geo-Scientist Prelims 2020 Chemistry Q91: Consider the following compound [A]:

QuestionStereochemistry / Fischer projections