Why does alkene hydroboration occur with non-Markovnikov regiochemistry? 6+ Ha CH. H2B Partial 3 cation H B (more stable transition state) 1-Methyleyclopentene CHa H BH2 Partial2°cation NOT formed (less stable transition state) 8+ 6+ H CH3 H No steric Steric crowding H---B....... crowding here H B --H here 2004 Thomson-Brooks/ColeWhy does alkene hydroboration occur with non-Markovnikov regiochemistry?