https://doi.org/10.1351/goldbook.08160
Symbols for depicting the flow of electrons in a chemical reaction or to generate additional resonance forms.
Note 1: The tail of the curly arrow shows where an electron pair originates, and the head of the curly arrow shows where the electron pair goes.
Note 2: Single-headed curly arrows are used to depict the flow of unpaired electrons.
Examples:
Source:
PAC, 2022, 94, 353. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 2021)' on page 395 (https://doi.org/10.1515/pac-2018-1010)
PAC, 2022, 94, 353. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 2021)' on page 395 (https://doi.org/10.1515/pac-2018-1010)