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Solvent effects in non-polar and polar [2 + 2] cycloadditions are examined with MC-SCF methods, using the dimerization of ethylene as a prototype of non-polar cycloaddition and the reaction between dicyanoethylene and hydroxyethylene as a prototype of polar cycloaddition. The effect of the solvent has been included via the continuum model of Rivail. Solvent effects stabilize the gauche transition...
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