Choose a conformer
Newman projections (computed from the model)
down C2→C3 · C1–C2–C3–C4 =
down C3→C4 · C2–C3–C4–C5 =
Front carbon at the center, back carbon is the circle. Click a projection to turn the 3D model to that view.
Skeletal structure
The 2D drawing is the same for every conformer. Hover a carbon to find it in 3D.
Lewis (full structural) formula
Distance between any two atoms
to
Or click any two atoms in the 3D model. Hydrogens are named by the carbon they sit on (H2a, H2b are both on C2).
Key distances in this conformer
Exercise: count the gauche interactions
Ideal geometry used in the model
| C–C bond length | 1.54 Å |
| C–H bond length | 1.09 Å |
| Every bond angle (tetrahedral) | 109.47° |
| Dihedrals | 180° or ±60° |
Every conformer keeps every carbon on the diamond lattice. Only the two C–C–C–C dihedrals change. Real molecules relax a little from these values, especially in the crowded gauche(+)–gauche(−) form.
How to use the 3D model
- Drag to rotate, scroll or pinch to zoom.
- Click 2 atoms for a distance, 3 for an angle, 4 for a dihedral.
- Use the Newman buttons to sight down a C–C bond.
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Click atoms to measure.