Abstract
Infrared group frequency correlations are presented which aid in spectra-structure identification of styrenes, α-methylstyrenes and related compounds. The vinyl and phenyl groups in styrene are coplanar in only those cases where atoms or groups such as Cl and CH<sub>3</sub> are not substituted in the 2,6-positions, and the isopropenyl and phenyl groups in α-methylstyrenes are coplanar in only those cases where atoms or groups such as Cl and CH<sub>3</sub> are not substituted in one ortho-position. Steric factors prevent the vinyl and phenyl groups from being coplanar in styrene substituted with atoms or groups in at least the 2,6-positions, and steric factors also prevent the isopropenyl and phenyl groups from being coplanar in 2-substituted α-methylstyrenes.
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