Why??

Why keto form is more stable than enol form???????[in general excluding special cases]

12 Answers

39
Dr.House ·

the process of conversion of carbonyl form into enol form is called wnoliation. and the ease of conversion of carbonyl into enol is called enolisability.

1
skygirl ·

is it always the case in general??

i think it depends ...

pls correct me if i am wrong...

39
Dr.House ·

as the acidic nature of α- hydrogen increases enolisability increases.

and in many aldehydes the enolisability is very less. this is because in most of the cases to the α- hydrogen an alkyl group is attached which is an electyron withdrawing group.

hence it decreases the acidity of the α-hydrogen thereby decreasing the enolisability.

therefore stability of enol form is veryy less.

24
eureka123 ·

Sorry .....I cant understand .......[2]

Can u explain in simpler words first rather than conventional scientific language....plzzzz[2]

39
Dr.House ·

i am sorry dude, thats the best way i could have explained.

29
govind ·

@eureka..which is more stable C=C or C=O ?

24
eureka123 ·

C=O bond has higher energy..

29
govind ·

so in chem everything wanna attain more stability ..since C=O is more stable than C=C in general cases..so keto form is more stable than enol...
Now this becomes a question for others why C=O is more stable than C=C ??

39
Pritish Chakraborty ·

@govind, something to do with orbital delocalisation and MO theory?

29
govind ·

@Pritish
Plz explain abt that orbital delocalistion.....
but the reason i know abt this phenomenon is somewhat different..

49
Subhomoy Bakshi ·

what is the thing that u know???

29
govind ·

For all those ppl who wanna the answer of the abv question can see the thread started by subhomoy..
http://www.targetiit.com/iit-jee-forum/posts/old-thread-was-unsolved-14822.html

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