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23<br />

1.3.3 Scheme 3<br />

O<br />

H<br />

H<br />

3 C<br />

3 C<br />

O<br />

NH 2<br />

NH 2<br />

O<br />

N<br />

H<br />

CH 3<br />

C 2<br />

H 5<br />

OH, reflux<br />

R<br />

C H 3<br />

O<br />

H 3 C<br />

CH 3<br />

O<br />

N<br />

H<br />

N<br />

H<br />

N<br />

R<br />

1.3.4 REACTION MECHANISM<br />

H 3<br />

RC<br />

O<br />

+<br />

R 1<br />

+H +<br />

C<br />

O<br />

R 1<br />

+H +<br />

H 3<br />

R<br />

..<br />

NH 2<br />

O<br />

CH 3<br />

-H + +<br />

NH 2<br />

CH 3<br />

-H +<br />

OH<br />

H 3<br />

C<br />

O<br />

H 3<br />

C<br />

O<br />

R<br />

..<br />

NH<br />

OH<br />

R 1<br />

+H +<br />

CH 3<br />

-H + R<br />

..<br />

NH<br />

R 1<br />

-H 2<br />

O<br />

+H 2<br />

O<br />

CH 3<br />

OH 2<br />

+<br />

H 3<br />

C<br />

O<br />

R 1<br />

H 3<br />

C<br />

O<br />

R 1<br />

-H +<br />

+H +<br />

R<br />

NH<br />

+ CH 3<br />

+H +<br />

R<br />

..<br />

NH CH 3<br />

-H +<br />

H 3<br />

HR<br />

OC<br />

H<br />

R<br />

+<br />

N<br />

R 1<br />

H<br />

CH 3<br />

R 1<br />

H 3<br />

-H +<br />

HOC<br />

-H +<br />

+H + H +H<br />

N<br />

CH +<br />

3<br />

R H<br />

H 3 C<br />

R 1<br />

H 2<br />

O +<br />

H ..<br />

N<br />

CH 3<br />

R H<br />

-H 2<br />

O<br />

+H 2<br />

O<br />

H 3 C<br />

R 1<br />

H<br />

N + CH 3<br />

R<br />

H<br />

C<br />

-H + N<br />

R 1<br />

R= COOC 2<br />

H 5<br />

R= COCH 3<br />

1<br />

3<br />

CH<br />

RH<br />

3<br />

H

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