A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6311G basis This set level. Some possible extensions ...

Recently, we introduced a new density-functional theory ~DFT! approach for the calculation of NMR shielding constants. First, a hybrid DFT calculation ~using 5% exact exchange! is performed on the molecule to determine Kohn–Sham orbitals and their energies; second, the constants are determined as in nonhybrid DFT theory, that is, the paramagnetic contribution to the constants is calculated from...

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In this paper, we explore the numerical feasibility of carrying out quantum dynamics calculations from ab initio points for gas phase chemical reactions. In this approach, the ab initio data are Ðrst generated from quantum chemistry programs on a coarse numerical grid and a quantum dynamics calculation is then carried out using data from these grids. A crucial step in the success of this method...