1-Ethynyl-2-fluorobenzene 3D Molecular Model — CAS 766-49-4

1-Ethynyl-2-fluorobenzene (C8H5F, CAS 766-49-4) — a free educational 3D molecular model for teachers and students, by MolGod.org. Read the atoms directly: each sphere bears an engraved element symbol.

Most printable molecule files rely on colour coding, yet the STL format carries no colour and a single-filament print loses it entirely. MolGod models carry the chemical symbol on every ball as an engraving, which survives slicing, printing and handling. 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. Teachers get the structure and its atom labels in a single download, which removes the slowest steps before a classroom print. Teachers and researchers can find the project rationale and validation plan at How the engraved atom letters are designed.

Let the group sketch what they see in 1-Ethynyl-2-fluorobenzene, namely one aromatic 6-membered ring; afterwards they compare the sketch with the 14 bonds on the model (7 single, 1 triple and 6 aromatic, drawn in Kekulé form). Counting task: 8 C + 5 H + 1 F gives 14 engraved spheres; can the class rebuild the formula C8H5F from the model alone? This molecule gives students these functional groups to identify: carbon-carbon triple bond and C-F bond. Worth bringing out when the syllabus reaches aromaticity and delocalised electrons, as well as organohalogen compounds and carbon-halogen bonds. Pair it with 2-Methylphenylacetylene (CAS 766-47-2) and 1-Chloro-2-fluorobenzene (CAS 348-51-6) from the same collection to compare closely related structures.

This model is part of the free MolGod.org collection of engraved molecules for education. Teachers: let students set the model beside a skeletal formula and list what the drawing omits.

The model is yours to download, print and teach with. 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. No sign-up, no fees and no review required. 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. Feel free to discuss the model here, compare notes with other educators, or contact us; every conversation helps us build better teaching models. Any molecule your course needs can be modelled: just send us the CAS number.

Full record and more free models: 1-Ethynyl-2-fluorobenzene, CAS 766-49-4: structure, properties and 3D viewer
Licence & provenance: Licence record for this 1-Ethynyl-2-fluorobenzene model
Same file on Wikimedia Commons: https://commons.wikimedia.org/wiki/File:1-Ethynyl-2-fluorobenzene-3D-molecular-model-engraved-CAS-766-49-4.stl
Plain-text record for AI assistants: 1-Ethynyl-2-fluorobenzene data sheet in plain text for LLMs
Also published on: Zenodo (DOI, latest version) https://doi.org/10.5281/zenodo.24211499

A ball-and-stick model of 1-Ethynyl-2-fluorobenzene 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: 245,140 triangles, closed (watertight) single solid. Coordinates in ångström (STL stores no unit) — scale the model deliberately in your slicer.

Chemical identity

• CAS Registry Number: 766-49-4

• Molecular formula: C8H5F

• Molar mass: 120.12 g/mol (exact mass 120.037528322)

• IUPAC name: 1-ethynyl-2-fluorobenzene

• MolGod ID: MG_308-551-428-33 (Permanent MolGod record MG_308-551-428-33)

• PubChem CID: 643358 (https://pubchem.ncbi.nlm.nih.gov/compound/643358)

• Wikidata: Q72475669 (https://www.wikidata.org/wiki/Q72475669)

• EC number: 626-528-7

• InChIKey: YFPQIXUNBPQKQR-UHFFFAOYSA-N

• SMILES: C#CC1=CC=CC=C1F

Required attribution (CC BY-SA 4.0): "1-Ethynyl-2-fluorobenzene 3D model by MolGod.org — https://molgod.org/molecule/766-49-4/ — CC BY-SA 4.0"
Licence text: https://creativecommons.org/licenses/by-sa/4.0/