Arrow Pushing¶
Use curved arrows to specify a local formal reassignment of electrons in a chemical structural drawing.
Core Idea¶
Arrow pushing uses curved marks on chemical structural drawings to show where an electron pair or an unpaired electron is formally reassigned. The tail identifies the electron source and the head its destination. A full arrowhead signifies a pair; a single-barbed fishhook signifies one electron. Bonds, lone pairs, and formal charges are then redrawn consistently.[ref-c851a7eb93e3][ref-8eb94461c098]
Scope of Application¶
The notation is used both in proposed reaction steps, where it can depict bond formation or cleavage, and in deriving alternative resonance contributors. These are different readings of the same local syntax. Resonance contributors represent one delocalized system; they are not molecular states successively interconverting in time.[^ref-60c80ffbc719]
Clarity¶
An arrow states which electrons a drawing reallocates, how many, and where. This helps distinguish a bond-forming proposal from cleavage and from a resonance redraw. It also separates a curved electron arrow within a molecular structure from a straight reaction or resonance separator between whole structures.[ref-c851a7eb93e3][ref-8eb94461c098][^ref-60c80ffbc719]
Manages Complexity¶
A few local marks can replace a long verbal description of changed bonds, lone pairs, and charges. This compactness does not prove a mechanism: a diagram may be internally consistent yet chemically or experimentally unsupported.
Abstract Reasoning¶
Starting with a structure, trace each tail to a genuine electron source, count electrons from its head style, apply the destination, and check the resulting bonds and formal charges. If the redraw is incoherent, the proposed notation fails. If it is coherent, the reaction claim still needs independent evidence; a resonance claim must preserve the atomic framework and total charge.[^ref-60c80ffbc719]
Knowledge Transfer¶
The convention transfers literally among chemical reaction and resonance drawings. Its general pattern is convention-governed symbolic representation, but its electron, bond, and charge grammar does not transfer unchanged to unrelated arrows in diagrams or flowcharts.
[^ref-c851a7eb93e3]: IUPAC Gold Book, “electron pushing”, DOI 10.1351/goldbook.08166. Official indexed definition consulted; direct page access was unavailable in the original source review. [^ref-8eb94461c098]: IUPAC Gold Book, “curly arrows”, DOI 10.1351/goldbook.08160. Official indexed definition consulted; direct page access was unavailable in the original source review. [^ref-60c80ffbc719]: University of Calgary, “Chemistry Textbook, Chapter 2: Molecular Structures in 2D”, §2.3 “Curved or Curly Arrows, Arrow pushing” and §2.4 “Resonance”, including its nitrite example and non-fluctuation explanation.
Relationships to Other Abstractions¶
Current abstraction Arrow Pushing Domain-specific
Parents (1) — more general patterns this builds on
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Arrow Pushing presupposes Structural Formula Domain-specific
Arrow pushing presupposes a chemical structural drawing that its marks update.
Hierarchy path (1) — routes to 1 parentless root
- Arrow Pushing → Structural Formula → Representation → Abstraction
Neighborhood in Abstraction Space¶
Arrow Pushing sits in a sparse region of the domain-specific corpus (78th percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.
Family — Chemical Structure & Reactivity Concepts (22 abstractions)
Nearest neighbors
- Drawing (manufacturing) — 0.84
- Isovalent Hybridization — 0.84
- Conjugated System — 0.84
- Valence Bond Theory — 0.82
- Oxidative phosphorylation — 0.82
Computed from structural-signature embeddings · 2026-10-08