31 Replies
@Dexter
Note for OP
+solved @user to close the thread when your doubt is solved. Mention the user who helped you solve the doubt. This will be added to their stats.What do the reagents do? Share an attempt na
Remove HBr for every mole of NaNH2 used
Then make an anion per NaNH2 used
Then attack CH3I from both the sides (2)
So obviously b is gonna be 2.
I'm getting a =2
And since NaNH2 just removes 1 Bromine per attack. It should be 4. but I am unable to get why is there a triple bond there.
You are removing 4 HBr and making anion on 2 sides
NaNH2 performs E2 elimination right?
So br and h need to be in anti
OH DAMN. GOT IT. 6 HBR ARE GONNA BE USED AND 2 CH3I
2 HBr will be used for making the negative charges turning it into electrophiles
There’s no stereochemistry here tho
a = 6 and b = 2. Sum will be 8
First convert it to an alkyne and then abstract the proton since it becomes more acidic when alkyne
a=4 b=2 ?
Wrong
wait i messed up
a = 6
b = 2
4 moles NaNH2 used for E2 as you said and you get 2 terminal alkyne ends
2 moles NaNH2 used to abstract terminal proton which is highly acidic making a nucleophile which attacks 2 moles of CH3I
a= 6 and b =2 ?
I got it
Sharing in a min
(I hate the one min timeout)
exactly
i used 2 nanh2 for e2 elimination and 2 for protonation thats why i got a=4
I still don't get one thing
After formation of alkene the carbon atoms gets planar hence there is no anti syn in br and h so how will further E2 occur
there are 2 H and 1 Br
which means that 1 H must by anti wrt Br and 1 must be syn wrt Br
But Br and H dekhna hai why you care about C
But carbon is sp2 which means it is planar
Which means br and h are in same plane
@!Nimay¡
sp2 se mtlb nahi hota
syn anti same side opposite side dekhne ke liye kaam aate hai
sp2 ke logic ke hisaab se sp3 me koi syn anti hi nahi hoga na as saare bond angles equal
Being planar doesn’t matter there’s still Br and H anti to each other
accha
thank you both of you
Anti periplanar best way to say is 180 degree
If Lg and H are 180 degree to each other they are anti lmao
+solved @!Nimay¡ @Linarp
Post locked and archived successfully!
Archived by
<@826025307064369185> (826025307064369185)
Time
<t:1714898395:R>
Solved by
<@553586861570916363> (553586861570916363)