File Name : fig_s1.tif

Caption :  free energy (kcal/mol) profiles of step i

File Name : fig_s2.tif

Caption : free energy (kcal/mol) profiles of step ii.

File Name : fig_s3.tif

Caption : fig. s3 free energy (kcal/mol) profiles of the unfavored reaction pathways.

File Name : fig_s4.tif

Caption : optimized structures of stereoselective transition states in gas phase and in 1,4-dioxane (italic). distances are given in å.