Thursday, 26 October 2006 - 8:30 AM
OLCC-McClain (Oakley-Lindsay Center)
18

Computational studies of the interaction between ethers and singlet carbenes in the gas phase and in solution

Ryan D. Quinn and Jean M. Standard. Illinois State University, Normal, IL

Experimental evidence suggests that ethers interact with singlet carbenes in solution to form ylides. In this project, the interaction between ethers and singlet carbenes was studied computationally in the gas phase and in solution. The singlet carbene studied was methylene and the ethers investigated included dimethyl ether, diethyl ether, tetrahydrofuran, 1,4-dioxane, and 1,3,5-trioxane. The ylide complexes were characterized by the calculation of gas phase optimized geometries, vibrational frequencies, and binding energies. These complexes were investigated at the B3LYP and MP2 levels of theory, using 6-31+G(d) and 6-311++G(d,p) basis sets. Solution phase binding energies for each of the carbene-ether complexes were also determined by the use of continuum solvation models. In general, the ylide complexes exhibited stabilization in polar solvents relative to the gas phase. Correlations among various properties, including binding energy, charge transfer, C-O distance, and relative basicity of the ether, were investigated.


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