when a chemical reaction closes a ring, its torquoselectivity is the same as enantioselectivity. a single enantiomer of a cyclization product is formed from the selective ring closure of the starting material. in a typical electrocyclic ring closing, selection for either conrotatory or disrotatory reactions modes still produces two enantiomers. torquoselectivity is a discrimination "between" these possible enantiomers that requires asymmetric induction.