Two confusing thing about (2R,3S)-2,3-dichloropentane:
- The 2 stereocenters have opposite absolute configuration.
- But there is no plane of symmetry.
So, is (2R,3S)-2,3-dichloropentane optically inactive?
(This is actually a follow-up question of: Monochlorination of 2-chloropentane and possible enantiomer products)