Also label enantiotopic CH2 hydrogens. They carry a genuine pro-R / pro-S
descriptor but are equivalent in an achiral environment (e.g. the CH2 of
ethanol), so they are skipped by default; diastereotopic (NMR-inequivalent)
hydrogens are always labelled.
Also label enantiotopic CH2 hydrogens. They carry a genuine pro-R / pro-S descriptor but are equivalent in an achiral environment (e.g. the CH2 of ethanol), so they are skipped by default; diastereotopic (NMR-inequivalent) hydrogens are always labelled.