Terephthaloyl chloride 3D Model — CAS 100-20-9

Terephthaloyl chloride (C8H4Cl2O2, CAS 100-20-9) — a free educational 3D molecular model for teachers and students, by MolGod.org. Every sphere shows which element it is through an engraved symbol, not a colour code. In Terephthaloyl chloride the ring system sets the overall shape: one aromatic 6-membered ring. Altogether 16 bonds hold the model together (8 single, 2 double and 6 aromatic, drawn in Kekulé form). How many atoms can the class find? The engraved spheres give 8 C + 4 H + 2 Cl + 2 O, so the answer should be 16. On the printed model, students can point to the two C-Cl bonds. Plan it into a unit on aromaticity and delocalised electrons, as well as on organohalogen compounds and carbon-halogen bonds. Pair it with Terephthalic Acid (CAS 100-21-0) and 4,4'-Dimethylbenzophenone (CAS 611-97-2) from the same collection to compare closely related structures. MolGod.org offers this engraved model free to anyone teaching or learning chemistry. Teachers: pair it with the MolGod.org record to connect the 3D shape with identifiers and data. Full record and more free models: https://molgod.org/molecule/100-20-9/?utm_source=thingiverse&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/