Terephthaloyl chloride 3D Molecular Model — CAS 100-20-9
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Free educational Terephthaloyl chloride model (C8H4Cl2O2, CAS 100-20-9) with an engraved element symbol on every atom.
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Terephthaloyl chloride (C8H4Cl2O2, CAS 100-20-9) — a free educational 3D molecular model for teachers and students, by MolGod.org. Instead of colour coding, every sphere carries its engraved element symbol.
Look at the skeleton first: Terephthaloyl chloride contains one aromatic 6-membered ring, and students can trace 16 bonds (8 single, 2 double and 6 aromatic, drawn in Kekulé form). A five-minute warm-up: read the symbol on every sphere and write down the totals (8 C + 4 H + 2 Cl + 2 O = 16 atoms). Spot-the-group challenge: can students find the two C-Cl bonds? Teachers covering aromaticity and delocalised electrons, as well as organohalogen compounds and carbon-halogen bonds will find it a concrete example. Students who finish early can look up Terephthalic Acid (CAS 100-21-0) and 4,4'-Dimethylbenzophenone (CAS 611-97-2), the closest neighbours in the collection, and list what differs.
Free for education: MolGod.org publishes engraved molecular models for teachers, students and schools. Teachers: give each table a model and have students write the formula from the engraved atoms.
Full record and more free models: https://molgod.org/molecule/100-20-9/?utm_source=printables&utm_medium=referral&utm_campaign=edu-3d-models
Licence & provenance: https://molgod.org/licenses/stl/100-20-9/
Same file on Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Terephthaloyl_chloride-3D-molecular-model-engraved-CAS-100-20-9.stl
A ball-and-stick model of Terephthaloyl chloride 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: 242,132 triangles, closed (watertight) single solid. Coordinates in ångström (STL stores no unit) — scale the model deliberately in your slicer.
Names in other languages: Terephthalsäuredichlorid (de); Tereftaloylchloride (nl); 对苯二甲酰氯 (zh).
Chemical identity
CAS Registry Number: 100-20-9
Molecular formula: C8H4Cl2O2
Molar mass: 203.02 g/mol (exact mass 201.9588348)
IUPAC name: benzene-1,4-dicarbonyl chloride
MolGod ID: MG_305-917-014-06 (https://molgod.org/id/MG_305-917-014-06)
PubChem CID: 7488 (https://pubchem.ncbi.nlm.nih.gov/compound/7488)
Wikidata: Q7702072 (https://www.wikidata.org/wiki/Q7702072)
EC number: 202-829-5
ChemSpider ID: 7207
InChIKey: LXEJRKJRKIFVNY-UHFFFAOYSA-N
SMILES: C1=CC(=CC=C1C(=O)Cl)C(=O)Cl
Required attribution (CC BY-SA 4.0): "Terephthaloyl chloride 3D model by MolGod.org — https://molgod.org/molecule/100-20-9/ — CC BY-SA 4.0"
Licence text: https://creativecommons.org/licenses/by-sa/4.0/