π-electron acceptor/donor group

https://doi.org/10.1351/goldbook.E04391
A @S06076@ capable of a +R (e.g. NO2) or −R (e.g. OCH3) effect, respectively.
See:
σ-constant
,
electronic effect
,
polar effect
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1155 [Terms] [Paper]
Citation: 'π-electron acceptor/donor group' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. https://doi.org/10.1351/goldbook.E04391 RIS BibTex EndNote
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Last revised: February 24, 2014