# THE VIBRATIONAL CIRCULAR DICHROISM SPECTRA OF SELECTED METHYL SUBSTITUTED 6,8-DIOXABICYCLO[3,2,1]OCTANES

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 Title: THE VIBRATIONAL CIRCULAR DICHROISM SPECTRA OF SELECTED METHYL SUBSTITUTED 6,8-DIOXABICYCLO[3,2,1]OCTANES Creators: Eggimann, T.; Ibrahim, N.; Wieser, H. Issue Date: 1990 Publisher: Ohio State University Abstract: The experimental infrared absorption and vibrational circular dichroism (VCD) spectra of a series of methyl substituted 6,8-dioxabicyclo[3,2,1]octanes are reported in the region $800 - 1500 cm^{-1}$. Vibrational intensities were calculated with the models of atomic polar tensor (APT), fixed partial charge (FPC), and charge flow (CF), based on the scaled and refined SCF ab initio 3-21G force fields. In general, APT and FPC reproduce the intensities satisfactorily and poorly, respectively, in accord with the results for the parent compound $6,8-dioxabicyclo[3,2,1]octane.^{1}$ In order to correct for the major shortcoming of the FPC model, different sets of charge flow parameters were employed, derived originally for propane, dimethyl ether and ethanol. It is demonstrated that only few parameters are necessary for reasonably accurate predictions of the absorption and VCD intensities. It appears that the charge flow parameters may be transferable between structurally related molecules Description: $^{1}$ T. Eggimann, R.A.Shaw, and H. Wieser, J. Phys. Chem., submitted. Author Institution: Department of Chemistry, University of Calgary URI: http://hdl.handle.net/1811/18327 Other Identifiers: 1990-TG'-9