72348G53129458621276235532 n

Keto

Transition State

Enol

(a)

K

i r*

o=o

_r\

( ch₂

0=0

CHS.

O—O—H

II

CH,

R .	R	R
I / i pł		I
(b) C=0 + H—A -►	C~ 0^i;r-H--A^5"	—r—► C— 0—H
/'I	l!	) II
	CH|"	H^+ CH*
Ił	II^6+

A"

■r- H₂0

T

H—A l OH"

Figurę 15-1 Mcchaimms of kcto-enol tantoniiri/ation. (a) Uncatalyzed. (J>) generał acid calalyzed, and (t) generał base catalyzed.

(c)

O

R

I (\

C=0

I

CH,

B

R

I -

C~0

CH®

h"

q8+

T

H⁺

I

C-0—H

II

CH,

dd:+ W