| Date | May 2017 | Marks available | 3 | Reference code | 17M.3.hl.TZ2.25 |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Describe | Question number | 25 | Adapted from | N/A |
Question
Taxol is produced using a chiral auxiliary. Describe how the chiral auxiliary functions to produce the desired product.
Markscheme
chiral molecule/auxiliary/optically active species added/connected/attached «to non-chiral starting molecule to force reaction to follow a certain path»
one enantiomer produced
OR
chiral auxiliary creates stereochemical condition «necessary to follow a certain pathway»
OR
stereochemical induction
OR
existing chiral centre affects configuration of new chiral centres
«after new chiral centre created» chiral auxiliary removed «to obtain desired product»
[3 marks]
Examiners report
[N/A]
