π-electron donor
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https://doi.org/10.1351/goldbook.08201
Substituent capable of electron donation by resonance (e.g.,
\(\ce{OCH3}\)
).
Source:
PAC, 2022,
94
, 353. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 2021)' on page 491 (https://doi.org/10.1515/pac-2018-1010)