Ethyl (triphenylphosphoranylidene)acetate 3D Molecular Model — CAS 1099-45-2

Ethyl (triphenylphosphoranylidene)acetate (C22H21O2P, CAS 1099-45-2) — a free educational 3D molecular model for teachers and students, by MolGod.org. Systematic name: Acetic acid, 2-(triphenylphosphoranylidene)-, ethyl ester. No legend required: the element symbol is engraved on each atom.

Ordinary molecular STL files leave students guessing, because the colour scheme that identifies atoms on screen does not survive printing. MolGod adds what the STL format leaves out by engraving the element symbol into each atom of the printed structure. Our goal as an education project: free files for teachers, designed so that students recognise atoms at a glance and spend their attention on bonds and structure. No CAD skills are needed on the teacher's side; the structure, geometry and labels come ready in one file. Read why we engrave the atoms, and which studies inspired the project: How the engraved atom letters are designed.

Let the group sketch what they see in Ethyl (triphenylphosphoranylidene)acetate, namely three 6-membered rings, all of them aromatic; afterwards they compare the sketch with the 48 bonds on the model (28 single, 2 double and 18 aromatic, drawn in Kekulé form). A five-minute warm-up: read the symbol on every sphere and write down the totals (22 C + 21 H + 2 O + 1 P = 46 atoms). Place it beside Ethyl benzoate (CAS 93-89-0) and Diethyl Phthalate (CAS 84-66-2) and ask students which features are shared and which are not. This molecule gives students these functional groups to identify: ester group (-COO-). Teachers covering aromaticity and delocalised electrons, as well as the carbonyl group (C=O) will find it a concrete example.

MolGod.org shares these models for free to make chemistry tangible in the classroom. Teachers: pass the model round at the start of the lesson, before showing any diagram.

Download it, print it and use it in your teaching. Sharing it somewhere? The licence (CC BY-SA 4.0) needs four things: "MolGod.org" credited as the creator, links to the original and to the licence, a mention of any changes, and adaptations released under the same licence. The attribution text below covers the first two. You don't need an account, you don't pay anything, and a review is entirely up to you. Every comment helps the project grow. Write a review, ask a question or suggest an improvement for educational use, here in the comments or via 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. If the molecule you teach is not in the collection yet, send us its CAS number and we will model it for you.

Full record and more free models: Ethyl (triphenylphosphoranylidene)acetate, CAS 1099-45-2: structure, properties and 3D viewer
Licence & provenance: Licence record for this Ethyl (triphenylphosphoranylidene)acetate model
Same file on Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Acetic_acid,_2-(triphenylphosphoranylidene)-,_ethyl_ester-3D-molecular-model-engraved-CAS-1099-45-2.stl
Plain-text record for AI assistants: Ethyl (triphenylphosphoranylidene)acetate data sheet in plain text for LLMs

A ball-and-stick model of Ethyl (triphenylphosphoranylidene)acetate 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: 785,982 triangles, closed (watertight) single solid. Coordinates in ångström (STL stores no unit) — scale the model deliberately in your slicer.

Chemical identity

• CAS Registry Number: 1099-45-2

• Molecular formula: C22H21O2P

• Molar mass: 348.4 g/mol (exact mass 348.12791691)

• IUPAC name: ethyl 2-(triphenyl-lambda5-phosphanylidene)acetate

• MolGod ID: MG_530-909-176-57 (Permanent MolGod record MG_530-909-176-57)

• PubChem CID: 70670 (https://pubchem.ncbi.nlm.nih.gov/compound/70670)

• Wikidata: Q126615351 (https://www.wikidata.org/wiki/Q126615351)

• InChIKey: IIHPVYJPDKJYOU-UHFFFAOYSA-N

• SMILES: CCOC(=O)C=P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3

Required attribution (CC BY-SA 4.0): "Ethyl (triphenylphosphoranylidene)acetate 3D model by MolGod.org — https://molgod.org/molecule/1099-45-2/ — CC BY-SA 4.0"
Licence text: https://creativecommons.org/licenses/by-sa/4.0/

License note: the CC BY-SA 4.0 license applies to the 3D model (STL) and its render. The framed presentation image (gold frame) is © MolGod.org, All rights reserved — see molgod.org/copyright.