--- title: "Ene reaction (Alder ene) Template – Chemistry Diagram | MolDraw" url: https://www.moldraw.com/templates/pericyclic-ene-reaction/ description: "Ene reaction (Alder ene) template: Propene and maleic anhydride give allylsuccinic anhydride: the C=C of the ene bonds to the enophile, the double bond moves…" lang: en publisher: Scidart Academy generated: 2026-11-13 --- [MolDraw](https://www.moldraw.com/) › [Templates](https://www.moldraw.com/templates/) › [Pericyclic reactions](https://www.moldraw.com/templates/pericyclic-reactions/) › Ene reaction (Alder ene) [Pericyclic reactions](https://www.moldraw.com/templates/pericyclic-reactions/)Premium # Ene reaction (Alder ene) template ![Ene reaction (Alder ene) template: Propene and maleic anhydride give allylsuccinic anhydride: the C=C of the ene bonds to the enophile, the double bond moves along and the allylic hydrogen is delivered to the enophile, all in one cyclic step.](https://www.moldraw.com/templates/pericyclic-ene-reaction.webp) [Edit in MolDraw](https://www.moldraw.com/)Download with Pro Premium template. Preview and edit it free in MolDraw; downloading and exporting it is part of [MolDraw Pro](https://www.moldraw.com/pricing). Propene and maleic anhydride give allylsuccinic anhydride: the C=C of the ene bonds to the enophile, the double bond moves along and the allylic hydrogen is delivered to the enophile, all in one cyclic step. ## Mechanism step by step An alkene with an allylic H adds to an enophile: new C–C bond, shifted C=C and H transfer 1. **Concerted ene step** – Six electrons (π, σ C–H and π of the enophile) move round a six-membered cycle ## Key points - Thermally allowed [σ2s + π2s + π2s] (six electrons, like a Diels–Alder in which one σ C–H bond replaces a π bond). - Breaking the C–H σ bond gives a higher barrier than a Diels–Alder: simple ene reactions need 150–250 °C, or a Lewis acid (carbonyl-ene with Me₂AlCl). - Electron-poor enophiles (maleic anhydride, acetylenedicarboxylates, glyoxylates, singlet O₂ in the Schenck ene reaction) react best. - Used industrially: alkenylsuccinic anhydrides (detergents, lubricant additives) come from alkenes and maleic anhydride. Drawn with 41 atoms, 5 arrows, 3 shapes – every one editable in MolDraw. ## Sources - [Fleming, Molecular Orbitals and Organic Chemical Reactions, Wiley 2010](https://openlibrary.org/isbn/9780470746585) Textbook - [Kürti & Czakó, Strategic Applications of Named Reactions in Organic Synthesis, Elsevier 2005](https://openlibrary.org/isbn/9780124297852) Textbook ## How to use this template 1. Press **Edit in MolDraw**. The template opens on the canvas of the free MolDraw editor. 2. Change anything: move structures, edit atoms and labels, recolour highlights or delete what you do not need. 3. Add your own structures, arrows and text next to it, or combine several templates on one page. 4. Export the drawing as PNG, SVG or PDF for slides, worksheets, theses and papers. ## Frequently asked questions ### Is the Ene reaction (Alder ene) template free? You can preview the Ene reaction (Alder ene) template here and open and edit it in MolDraw for free. Downloading or exporting it is part of MolDraw Pro, together with the other premium templates. ### Can I edit the Ene reaction (Alder ene) template? Yes. It opens as an ordinary MolDraw drawing, so every structure, arrow, label and colour can be changed, and you can add your own content around it. ### Is the chemistry checked? Every structure is checked with RDKit and every curly arrow passes MolDraw’s electron-flow audit. The sources used are listed on this page. ### Do the pericyclic templates show orbital symmetry? They show the curly arrows, the stereochemical outcome and the Woodward–Hoffmann rule that predicts it (conrotatory or disrotatory, endo or exo). ## More pericyclic reactions templates [**Diels–Alder reaction: the endo rule**Free · Pericyclic reactions](https://www.moldraw.com/templates/pericyclic-diels-alder-endo/)[**Diels–Alder regiochemistry**Free · Pericyclic reactions](https://www.moldraw.com/templates/pericyclic-diels-alder-regio/)[**Cope and oxy-Cope rearrangements**Free · Pericyclic reactions](https://www.moldraw.com/templates/pericyclic-cope-oxy-cope/)[**Claisen rearrangement**Premium · Pericyclic reactions](https://www.moldraw.com/templates/pericyclic-claisen/)[**Electrocyclic ring closure**Premium · Pericyclic reactions](https://www.moldraw.com/templates/pericyclic-electrocyclic/)[**1,3-Dipolar cycloaddition**Premium · Pericyclic reactions](https://www.moldraw.com/templates/pericyclic-dipolar-cycloaddition/)[**[1,5]-Sigmatropic hydrogen shift**Premium · Pericyclic reactions](https://www.moldraw.com/templates/pericyclic-15-hydrogen-shift/)[**Nazarov cyclisation**Premium · Pericyclic reactions](https://www.moldraw.com/templates/pericyclic-nazarov/) ## Related pages [**Curved Arrow Mechanism Worksheet**Free printable worksheet](https://www.moldraw.com/educational-materials/curved-arrow-mechanism-worksheet/)[**All Pericyclic reactions templates**11 templates](https://www.moldraw.com/templates/pericyclic-reactions/)[**All chemistry templates**525 templates in 31 categories](https://www.moldraw.com/templates/) MolDraw Pro Download all 525 templates - Export the 437 premium templates as PNG, SVG or PDF - AI chemistry assistant - Structure scanning from images - Cloud save and teaching slides [See Pro plans](https://www.moldraw.com/pricing) Free templates stay free. 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