Thermodynamic properties (S298, Cp(T), internal rotations and group additivity parameters) in vinyl and phenyl hydroperoxides†
Abstract
Thermodynamic properties, S298° and Cp,298(T) (300 ⩽ T/K ⩽ 1500)) and internal rotational barriers for trans-CH3CHCHOOH, cis-CH3CH
CHOOH, (CH3)2C
CHOOH and CH3CH
C(CH3)OOH are calculated using density functional calculations at the B3LYP/6-311G(d,p) levels. Entropies (S298° in cal mol−1 K−1) and heat capacities Cp298(T) in cal mol−1 K−1) were calculated using the B3LYP/6-311G(d,p) determined frequencies and geometries. Thermodynamic properties for the oxygenated carbon group O/Cd/O are determined with existing literature values of group parameters and data on trans-CH3CH
CHOOH, cis-CH3CH
CHOOH, (CH3)2C
CHOOH, CH3CH
C(CH3)OOH, CH2
C(CH3)OOH. The O/Cb/O group was estimated by using the data calculated on C6H5OOH. The moments of inertia and vibrational frequencies as well as the structure parameters have been reported in an earlier study.