Endeross

5+ Year Member
Mar 3, 2015
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Dental Student
because the bh3 comes in on one side and drops itself and a hydrogen in the mix on that same side. Look at this picture and see if you understand what i mean https://upload.wikimedia.org/wikipe...g/759px-Hydroboration_mechanism_in_alkene.png

Granted, this is an alkene but the idea is the same, It attaches at 2 points simultaneously which forces the methyls to go away from the H and B as they attach, this puts the methyl's cis to eachother
 

bigbutrealdreams

2+ Year Member
Aug 24, 2015
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