SEARCH Articles Figures Tables Bond and bonding rotation Bond and bonding rotation Bond lengths and rotational Bond lengths and rotational barriers Bond rotation Bonding Multiplicity and Internal Rotation Effects of Internal Rotation and Bond Stretching Rotatable Bonds, Unsaturations, Rings, Chains and Ring Topology Rotatable bonds Rotation about Sigma (a) Bonds in Acyclic Alkanes, Alkenes, Alkynes, and Alkyl-Substituted Arenes Rotational Constants. Bond Distances and Angles Sigma bonds and bond rotation