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Where does the O-O-H come from in this hydroboration-oxidation mechanism?

by Lo.Lee.Ta.
Tags: mechanism
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Lo.Lee.Ta.
#1
Nov23-12, 02:36 AM
P: 209
I cannot for the life of me figure out where the O-O-H comes from that got added in the
3rd step!

Here's image of the reaction mechanism:



The H2O is not used until the last step and the H2O2 has already been used (except for the H+), so the other O that adds to the OH- to form O-O-H must be coming from the NaOH when it dissociates into Na+ and OH-...
But this would not make sense because we would have an OH- and an O- adding together, and that would be too many electrons!

Thank you so much! :)
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AGNuke
#2
Nov23-12, 11:10 AM
PF Gold
AGNuke's Avatar
P: 456
There is more of H2O2 from where it came from.
Lo.Lee.Ta.
#3
Nov23-12, 01:38 PM
P: 209
Oh! Okay! I thought that there could only be one molecule of H2O and H2O2 and NaOH because that is what is shown on the reaction arrow.
But, I guess, that only shows what is being used...not the quantities of each...

Thank you! :)


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