The Internet Archive.pdf

Cyclohexane undergoes a conformational change known as the ring-flip process, where each axial substituent becomes equatorial and each equatorial becomes axial. The carbon skeleton undergoes inversion, and the substituents swap positions. This process can be viewed through a Newman projection, where the equatorial substituents twist into axial positions and the axial substituents twist into equatorial positions. The Minimum Energy Pathway (MEP) describes the atomic movements that bring about the ring-flip process, following the path of least resistance on cyclohexane's potential energy surface. The MEP connects one valley to another through a saddle point, which is the transition state. The energy landscape of cyclohexane is represented by a contour plot, where the x and y axes correspond to torsion angles, and the contour lines represent equipotential curves. The ring-flip process involves a twist conformation intermediate, and the valley of the twist form is a minimum valley on the energy landscape. The twist form is an intermediate on the ring-flip MEP, and the boat form is a transition structure.