Preferential formation in a chemical reaction of one diastereoisomer over another.
Note:
This can be expressed quantitatively by the diastereoisomeric excess or by the diastereomeric ratio, which is preferable because it is more closely related to a Gibbs-energy difference.
Source:
PAC, 2022, 94, 353. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 2021)' on page 401 (https://doi.org/10.1515/pac-2018-1010)