12 Replies
@Dexter
Note for OP
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naa naa kyunki reaction ke liye halide chiye
par kyun
-OH to -CN is also nucleophilic substitution na
Because it is stronger Nu than Halide ?
-OH Group hi leave ni krega
so no
and CN- also cannot substitute in SN2 Reactions
mujhe bata bro ki Ethanol ko Ethyl Iodide me convert krna rahega
phir
hi
nucleophilic sub hoga
with KCN
@iTeachChem Verify please. I haven't studied chem from last year
So no, you can't just add KCN to ethanol and expect it to turn into propanenitrile. The -OH group in ethanol is a terrible leaving group, so the reaction won't work. Instead, ethanol has to be converted into ethyl iodide (CH₃CH₂I) using P/I₂ first because iodine is a much better leaving group. Only then can KCN step in and swap the iodine for a -CN group, giving you propanenitrile. So, it's a two-step process no shortcuts
thought about that, but if OH is a terrible leaving group what makes it leave for iodine instead of cyanide?
you will have to make it an alkoxide first (ie strong base) then sn2
James Ashenhurst
Master Organic Chemistry
Comparing the SN1 and SN2 Reactions
SN1 vs SN2 : how are they different? We compare the mechanisms, rate-determining steps, rate laws, nucleophiles, and stereochemistry of sn1 and sn2
aprotic solvent (DMSO type)
according to the comic, iodine is just a big gentle cat who gets bullied by new kittens on the block
10/10 explanation