Reaction Mechanism Visualizer
Visualize curved-arrow reaction mechanisms step by step. This guide explains what the topic is used for, the chemistry ideas behind it, and how students should approach related problems manually.
What a Curved Arrow Actually Means
A curved arrow always tracks a pair of electrons, never an atom. The tail sits on the electron source, either a lone pair or an existing bond, and the head points to where those electrons end up, either forming a new bond or landing on an atom as a lone pair.
A full-headed arrow moves two electrons; a single-barbed fish-hook arrow moves just one electron in radical mechanisms. Mixing these up is a common reason a drawn mechanism looks plausible but is electronically wrong.
Find the Nucleophile and Electrophile First
Before drawing any arrows, identify which atom is electron-rich and looking to donate (the nucleophile, often a lone pair, anion, or pi bond) and which atom is electron-poor and looking to accept (the electrophile, often a carbon attached to a leaving group or a polarized carbonyl carbon).
Every arrow in the mechanism should start near the nucleophile and end at or near the electrophile; if an arrow seems to start at an electron-poor atom, the mechanism step is likely drawn backward.
Recognize the Mechanism Archetype
Most introductory mechanisms fall into a handful of patterns: substitution (a nucleophile replaces a leaving group), addition (a pi bond is broken and two new sigma bonds form across it), elimination (a base removes a proton while a leaving group departs, forming a new pi bond), and proton transfer (an acid-base step that often starts or ends a longer mechanism).
Naming the archetype before drawing arrows narrows down which bonds should break and form, instead of guessing arrow by arrow.
Check the Mechanism Before Trusting It
After drawing a full mechanism, verify three things: overall charge is conserved at every step, every atom present at the start is still present at the end, and no arrow starts on an atom that has no electrons to give (a positively charged carbon, for instance, cannot be an arrow's tail).
The planned visualizer will animate these steps and flag exactly this kind of arrow-legality error, but the manual check above is the same logic it will automate.
Related Chemistry Tools
Molecular Weight Calculator
Calculate molar mass from formulas with parentheses and bracket groups.
Chemical Equation Balancer
Balance chemical equations and verify atom counts on both sides.
pH Calculator
Calculate pH, pOH, [H+], and [OH-] for acid-base problems.
Reaction Mechanism Visualizer is an educational chemistry tool for visualize curved-arrow reaction mechanisms step by step.
It uses standard textbook equations and atomic masses. For laboratory or clinical decisions, verify with official protocols.
Yes. The lower-right chemistry chat can explain concepts and recommend relevant Chemistry Tools pages using the site knowledge base.
Yes. The tool layout collapses to one column with mobile-safe inputs.