I got this question in mind now while reading the answer bro.. why is it ignored btw?
As the answer to this qn I had thought of just the +ve charge explanation not about the steric hindrance perspective
And in the diagram, why have u put H attached with sp2 carbon in wedge bro?? It's planar right
Jusr edited, added some pics. See that
Steric hindrance is considered in cases where there are multiple groups, not generally
And yes, its sp2, good observation, H should be in plane
Thanks for the pics bro but I couldn't find where it's written about that steric hindrance part .. sry to bug
Yeah it is right imo .. Didnt get u
I'm not able to visualise ring rearrangement Like where + comes . How to do ?
Why not this
Yeah yours is right bro. But the video is also right because that is a symmetrical ring
Im confused with mechanism of hydroboration oxidation of alkenes somewhere it's given trialkyl borane is formed in the first step, somewhere we write it as BH2-H and then do a concerted reaction adding according to markonikoff
Yes, the mechanism is concerted (Those dashed lines represent partial bonds). The new bonds to carbon are forming at the same time as the C-C π bond is breaking. The result is that the stereochemistry is “syn”.
We write as Bh2-h just ro emphasis that h will remove and Bh2 will attach
Is this mechanism in syllabus? I heard it's not
I dunno. Please see syllabus
Never needed mechanism of this rkn though
Just take a look for reference.
We can directly do , like add bh2 on less crowded site and then after reaction with naoh/H2O2 , add oh in place of bh2
It's NMe3 only see the product he made
Ya, but why H is left in first step ? It won't be
a quaternary ammonium salt
H will be removed in the very first step itself
He has written the Mechanism wrong