Symmetry Lab › S4 › 1,3,5,7-Tetramethylcyclo-octatetraene (methyl C shown)
C₈H₄(CH₃)₄ 1,3,5,7-Tetramethylcyclo-octatetraene (methyl C shown)
Tub with four methyls · point group S4 · order 4
- Point group
- S4 — An S4 improper rotation axis (rotate, then reflect) with no mirror plane; it contains a C2 axis.
- Order
- 4
- Operations
- E, S₄, C₂, S₄³
- Shape
- Tub with four methyls
- Atoms
- 16 (C × 12, H × 4)
Symmetry elements of C₈H₄(CH₃)₄
- S₄ — rotate 90° about the tub axis, then reflect
- C₂ — the tub axis (S₄²)
Structure
- Ring C=C 1.34 Å, C–C 1.48 Å
- Methyl on every second carbon
- The methyls kill the C₂′ axes and σd planes of the tub; only S₄ (and C₂) remain
