Steric hindrance between an axial substituent on a chair conformation and the hydrogens on ring positions three carbons away.
The formation of bent σ bonds in rings (3-, 4-membered) to accommodate
Energetic cost of putting a substituent group in the axial position of a
cyclohexane Chair as opposed to the equatorial position.
Bond positions on the cyclohexane chair parallel to the central rotation axis.
These are typically drawn as vertical lines branching from the chair structure.
A compound that contains two rings which share atoms with each other.
No bridgehead alkenes. Bridgehead carbons are too constrained in the ring
structures to incorporate double bonds.
Joining of rings with more than two atoms. These shared atoms constitute a
Points at which rings meet in bridged polycyclic hydrocarbons.
Less stable conformation of cyclohexane; resembles a boat.
The most stable conformation of cyclohexane; resembles a lawn chair.
Interconversion between two chair conformations.
Bond positions on the cyclohexane chair that lie sideways toward the
equatorial plane of the chair.
Hydrogens at two ends of the cyclohexane boat conformation that repel each
other due to steric hindrance.
The joining of rings that share two atoms and the bond between them.
Heat of Formation
The energy change that occurs when a molecule is assembled from its component
Compound that contains several rings joined with common atoms.
Unfavorable energetics that arise from ring formation. These include both
angle strain and torsional
Ring joining that shares a single atom, creating rings that lie in perpendicular
Repulsion between the electron clouds on bulky groups of a molecule or
Resistance to rotation about a single bond caused by steric hindrance