tautomerism Flashcards
1
Q
about TM
A
special type of FG iso
rapidly interconvertible at room temp in acidic/basic med
Are in dynamic equilibrium
2
Q
keto-enol isomerism
A
> C=O TO -C=C-OH
changing keto into enol is enolisation
3
Q
hydrogen must be at sp3 carbon or alternate to double bond
A
triad type iso- H goes from 1st position to 3rd position
4
Q
bond energy
A
C=O> C=C
Therefore, 99% keto and 1% enol
5
Q
why called prototropy also?
A
bcz this reaction takes place due to oscillation of proton
6
Q
tautomerism on the basis of shifting of active H
A
Triad (1,3) {most common}
Diad (1,2)
7
Q
if more than 3rd position
A
para/ space TTM
8
Q
bridged hydrogen do not show TTM
A
violation of Bredt’s rule
9
Q
bredt’s rule
A
at bridgehead position, +ve charge or sp2 carbon cannot be created upto 7 carbon ring.
