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592 Chapter 17

Copyright © 2017 Pearson Education, Inc.

87.

a.

O

LDA/THF 78 ºC _

LDA/THF 0 ºC

O

OCH

O

O

O

O

O

O

O

O

OCH

O

O

3

OCH

3

O

O

OCH

3

CH I

3

CH I

3

3

OCH

3

_

CH OH

CH O

3

3

_

CH O

3

_

_

At 0 ºC, the thermodynamic enolate is formed

(the hydrogen is removed from the

more substituted

α

-carbon).

At 78 ºC, the kinetic enolate is formed

(the hydrogen is removed from the

less substituted

α

-carbon).

_

/

CH OH

3

/

b.

O

O

O

O

H

O

OCH

3

CH O

3

CH O

3

_

_

O

_

O

O

OCH

3

OCH

3

_