SEARCH Articles Figures Tables Alkynes orbital bonding interactions Bond interactions Bonded interactions Bonding interactions Electrostatic and Orbital Interactions in H Bonds Natural bond orbital analysis interaction Natural bond orbital donor-acceptor interactions Natural bond orbital vicinal interaction Non-bonding orbital interaction Orbital interaction theory sigma bonds Orbital interactions chemical bonds SIGMA BONDS AND ORBITAL INTERACTION THEORY Three-orbital interactions stereoelectronic reasons for the preferred trajectories of intermolecular attack at a chemical bond