Question

identify all of the chirality centers in the structure.
the chirality centers are:
□ a □ b
□ c □ d
□ e □ f
□ g □ h
□ i □ j
□ k □ l
□ m □ n
□ o □ p
□ q □ r

Explanation:

Step1: Define chirality center

A chirality center is a tetrahedral atom (usually C) bonded to 4 distinct groups; sp² C (double-bonded) is excluded.

Step2: Evaluate each labeled atom

• A: C bonded to C₆H₅, H, NHCOC₆H₅, and group B → 4 distinct groups: chiral.
• B: C bonded to OH, H, group A, and COO-group C → 4 distinct groups: chiral.
• C: C bonded to O-ester, H, group H, and group D → 4 distinct groups: chiral.
• D: sp² C (double bond) → not chiral.
• E: sp² C (double bond) → not chiral.
• F: C bonded to 3 identical CH₃ groups → not chiral.
• G: C bonded to OH, group H, group I, and two CH₃ (on F) → 4 distinct groups: chiral.
• H: C bonded to group C, group G, H, and ring C → 4 distinct groups: chiral.
• I: C bonded to OCOC₆H₅, group G, group J, and H → 4 distinct groups: chiral.
• J: C bonded to group I, group K, and ring C → 4 distinct groups: chiral.
• K: C bonded to 2 CH₃ groups, group J, and group N → not chiral.
• L: sp² C (carbonyl) → not chiral.
• M: C bonded to OAc, group E, group L, and H → 4 distinct groups: chiral.
• N: C bonded to OH, group K, group O, and H → 4 distinct groups: chiral.
• O: C bonded to group N, group P, H, and O → 4 distinct groups: chiral.
• P: C bonded to group O, group R, and 2 O atoms → 4 distinct groups: chiral.
• Q: sp² C (carbonyl) → not chiral.
• R: C bonded to OAc, group J, group P, and ring C → 4 distinct groups: chiral.

Answer:

A. A, B. B, C. C, G. G, H. H, I. I, J. J, M. M, N. N, O. O, P. P, R. R