Origins of Stereoselectivities of Dihydroxylations of <i>cis</i>-Bicyclo[3.3.0]octenes Hao Wang Philipp Kohler Larry E. Overman K. N. Houk 10.1021/ja3075538.s002 https://acs.figshare.com/articles/dataset/Origins_of_Stereoselectivities_of_Dihydroxylations_of_i_cis_i_Bicyclo_3_3_0_octenes/2483410 Stereoselectivities of the dihydroxylations of <i>cis</i>-bicyclo­[3.3.0]­octene intermediates for a projected total synthesis of chromodorolide A have been explored experimentally. The reaction occurs unexpectedly on the apparently more hindered (concave) face; this result has been explained through computational studies using B3LYP and B3LYP-D3 methods. Torsional effects are largely responsible for the stereoselectivity encountered in the chromodorolide A synthesis. Many literature examples have been reported on related cases. QM calculations show that the stereoselectivities of dihydroxylations of fused cyclopentenes are influenced by the conformational rigidity or flexibility of the substrate. Torsional, electrostatic, and steric effects can all influence stereoselectivity, and the rigidity or flexibility of conformations of reactants provides a predictive guide to stereoselectivity. 2016-02-20 10:39:30 chromodorolide Torsional effects rigidity steric effects Many literature examples influence stereoselectivity dihydroxylation synthesis B 3LYP QM calculations show flexibility B 3LYP methods