Abstract
Ab initio calculations with full geometry optimization have been performed for β-CF3-substituted cis- and trans-methyl crotonates, methyl-β,β-bis(trifluoromethyl) acrylate, and dimethylhexafluoroisopropylidene malonate using the restricted Hartree-Fock (RHF) method (6-31G* basis set). The effects of substituents at the multiple bond on the geometrical and electronic structure, dipole moments, polarizability and first molecular hyperpolarizability tensors, normal vibration frequencies, one-electron levels, electrostatic potentials, and local electron density at the C=C bond have been studied. Two substituents in the acrylic system prevent the conjugation of C=C and C=O bonds. The major effect on the structure and properties of the title compounds is produced by π-π interactions of the CF3 group with the multiple bond and by incoherent exchange interactions of substituents at the C=C bond.
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Borisov, Y.A., Kolomiets, A.F. & Fokin, A.V. Effects of Trifluoromethyl and Alkoxycarbonyl Groups on the Structure and Reactivity of Acrylates. Journal of Structural Chemistry 44, 559–566 (2003). https://doi.org/10.1023/B:JORY.0000017930.33418.ee
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DOI: https://doi.org/10.1023/B:JORY.0000017930.33418.ee