For students
Arrow-pushing practice that checks every step
Practice organic mechanisms one problem at a time. Every structure is already drawn: add the curved arrows that turn each one into the next, press Check, and Athanor follows your electrons and tells you which step went wrong. Hints when you want them and a streak to keep. Free, in the browser, no account needed.
Checked step by step
Check pushes your arrows and compares what they make with the structures drawn next. A wrong answer names the step and why, for example: “Step 1: pushed, these arrows make C4H10ClO-, which is not what you drew next.”
Hints before answers
The first hint says what the mechanism does; another hint counts the arrows in each step. The answer stays locked until you ask for it, and showing it ends your streak.
Choose what to practice
Pick from SN2, E2, proton transfer, cyanohydrin formation, hydride addition, SN1, SN1 with a hydride shift, E1 and E1 with a hydride shift, set Easy, Medium or Hard and High school, Undergraduate or Graduate, and Next problem keeps dealing more. Turn on Also draw the products to draw the structures yourself as well.
A streak to keep
The panel counts the problems you solve and your current streak. Before you check, say how sure you are: I know it, I think so, or Guessing.
Open Athanor and choose Practice arrow-pushing on Home: it opens the problem set builder with Practice for myself (not graded) turned on. Teaching a course? With that switch off, the same builder makes mechanism homework that grades itself.