Kinetic Energy Functions of the Ring Bending and Ring Twisting Vibrations of Asymmetrically Substituted Six Membered Rings

Vector models were developed for calculating the kinetic energy (reciprocal reduced mass) expressions for the ring-bending and single bond ring-twisting vibrations of six-membered rings with one double bond. These models are valid for asymmetrically substituted rings. A two-dimensional kinetic energy calculation was carried out and the twist-bend cross terms were also calculated. The reduced masses calculated for several oxygen-containing analogs of cyclohexene increase as the ring bends or twists. Kinetic energy expressions as functions of the vibrational coordinates were derived.