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Infrared Group Frequency Correlations for Styrenes, -Methylstyrenes, and Related Compounds
Volume 40, Number 2 (Feb. 1986) Page 196-203
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 CH3 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 CH3 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.