Diallylidene pentaerythritol, C₁₁H₁₆O₄, 78-19-3

Diallylidene pentaerythritol (C11H16O4, CAS 78-19-3) — a free educational 3D molecular model for teachers and students, by MolGod.org. Element symbols are cut into each atom sphere: a self-labelled teaching aid. On a typical printed molecule every sphere is the same anonymous ball, since the STL file cannot transmit the usual colour convention. MolGod models carry the chemical symbol on every ball as an engraving, which survives slicing, printing and handling. Our intended outcome is simple: students who hold the model should know each atom immediately and use the lesson to understand the molecule's structure. Instead of building a model from scratch, a teacher can go straight from the molecule's name to a file in the slicer. Background, references and the planned classroom study: How the engraved atom letters are designed. In Diallylidene pentaerythritol the ring system sets the overall shape: two 6-membered rings. Altogether 32 bonds hold the model together (30 single and 2 double). Hand the model round and let students tally the engraved atoms: 11 C + 16 H + 4 O, 31 in total. Where on the model can students see the four ether linkages (C-O-C) and the two carbon-carbon double bonds (C=C)? Let them search before you reveal the answer. Find the three stereocentres of Diallylidene pentaerythritol first; because this record gives no R or S, the follow-up question is what the mirror image would look like. Topics it supports in class: chirality, enantiomers and CIP (R/S) rules. Part of the MolGod.org free library of engraved molecules for chemistry classrooms. Teachers: hand out printed copies and ask students to rebuild the structural formula from the model. The model is yours to download, print and teach with. When you publish a photo, a worksheet or a remix, CC BY-SA 4.0 requires you to credit "MolGod.org" as the author of the model, link to the original and to the licence, indicate any changes and share remixes under the same licence (the ready attribution line is below). No sign-up, no fees and no review required. Feedback is the most important part of this project: your review in the comments shows us how to improve the whole collection and build better models. Contact: Write to the MolGod team. Have an idea for a lesson built around this molecule? Share it in the comments so other teachers can use it too. Looking for another compound? We gladly create an engraved 3D model for any CAS number you send us. Full record and more free models: Diallylidene pentaerythritol, CAS 78-19-3: structure, properties and 3D viewer Licence & provenance: Licence record for this Diallylidene pentaerythritol model Same file on Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Diallylidene_pentaerythritol-3D-molecular-model-engraved-CAS-78-19-3.stl Plain-text record for AI assistants: Diallylidene pentaerythritol data sheet in plain text for LLMs A ball-and-stick model of Diallylidene pentaerythritol with each element symbol recessed into its atom sphere, generated by MolGod.org from a PubChem-computed 3D conformer (not an experimental crystal structure); atomic coordinates and connectivity are unchanged. STL mesh: 520,918 triangles, closed (watertight) single solid. Coordinates in ångström (STL stores no unit) — scale the model deliberately in your slicer. Names in other languages: 3,9-Divinyl-2,4,8,10-tetraoxaspiro[5.5]undecan (de); 3,9-Divinyl-2,4,8,10-tétraoxaspiro(5,5)undécane (fr). Chemical identity - CAS Registry Number: 78-19-3

- Molecular formula: C11H16O4

- Molar mass: 212.24 g/mol (exact mass 212.10485899)

- IUPAC name: 3,9-bis(ethenyl)-2,4,8,10-tetraoxaspiro[5.5]undecane

- MolGod ID: MG_488-938-494-89 (Permanent MolGod record MG_488-938-494-89)

- PubChem CID: 66218 (https://pubchem.ncbi.nlm.nih.gov/compound/66218)

- Wikidata: Q17521015 (https://www.wikidata.org/wiki/Q17521015)

- EC number: 201-092-7

- ChemSpider ID: 59603

- InChIKey: OOXMQACSWCZQLX-UHFFFAOYSA-N

- SMILES: C=CC1OCC2(CO1)COC(OC2)C=C

Required attribution (CC BY-SA 4.0): "Diallylidene pentaerythritol 3D model by MolGod.org — https://molgod.org/molecule/78-19-3/ — CC BY-SA 4.0" Licence text: https://creativecommons.org/licenses/by-sa/4.0/