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Organic Reactions Volume 4 - Sciencemadness Dot Org

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Addends<br />

p-Benzoylacrylic acid<br />

{Cont'd)<br />

2,3-Dimethylbuta- f<br />

diene<br />

2,3-Diphenylbutadiene<br />

B<br />

@-Benzoylacrylic<br />

add}2t4^dimethyl-<br />

2,3-Dimethylbuta- r<br />

diene<br />

I<br />

isomer<br />

L<br />

TABLE V—Continued<br />

THE DIELS-ALDEB ADDITION OF «,JS-UNSATTTRATED CARBONYL COMPOUNDS<br />

9<br />

Products<br />

p^Hcwr^<br />

isomer<br />

P ^ CH3O2(T^<br />

O<br />

HsC ^H02cA<br />

-CH3<br />

-CH3<br />

^CgHg<br />

J 1 C5H5<br />

)£<br />

Ratio of<br />

Diene<br />

to Dienophile<br />

1.45<br />

2.3<br />

1.8<br />

Solvent<br />

Absolute<br />

ethanol<br />

Absolute<br />

i ethanol<br />

—<br />

Absolute<br />

ethanol<br />

Absolute<br />

ethanol<br />

Temperature,<br />

0 C<br />

100-105t.<br />

100-105t.<br />

165<br />

100-105t.<br />

100-105t. j<br />

Time,<br />

hours<br />

96-120<br />

96-120<br />

15<br />

96-120<br />

96-120<br />

B.P. or M.P.<br />

143<br />

189<br />

147<br />

150.5<br />

165.5<br />

Yield,<br />

: %<br />

; 95-98<br />

—<br />

52<br />

95-98<br />

—<br />

Refer-<br />

I ences *<br />

19<br />

19<br />

3<br />

19<br />

19<br />

O<br />

i—i<br />

O<br />

I<br />

><br />

H-I<br />

O<br />

02

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