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Organic Reactions Volume 4 - Sciencemadness Dot Org

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SYNTHESIS OF BENZOQUINONES BY OXIDATION 331<br />

TABLE II—Continued<br />

ALKYL AND ARYL QUINONES AND THEIR SUBSTITUTED DERIVATIVES<br />

Quinone<br />

2,6-Dibromoquinone j<br />

2,6~Dibromo-3-fluoroquinone<br />

2,6-Dibromo-3-chloro~<br />

quinone<br />

2,3- or 2,5-Dibromo-<br />

6-chloroquinone<br />

2,5-Dibromo-3,6~dichloroquinone<br />

f<br />

2,6-Dibromo-3,5-dichloroquinono<br />

I<br />

Tribromoquinone \<br />

r<br />

[_<br />

Tribromochloroqui- J<br />

none |<br />

Bromanil (tetfa- J<br />

bromoquinone) 1<br />

Substance Oxidized<br />

2,4,6-Tribromophenol<br />

2,4,4,6-Tetrabromooyclohexadienone<br />

2,6'-Dibromoaniline<br />

3,5-Dibromosulfanilic<br />

acid<br />

2,6*Dibromo-4-amino~<br />

phenol<br />

2,6'-Dibromo-4-bromo<br />

(chloro and fluoro)<br />

phenol<br />

2,4,6-Tribromo~3-fluorophenol2,4,6-Tribromo-3-chlorophenol<br />

2,3- or 2,5 Dibromo-4,6dichlorophenol2,6*-Dichloro-4-nitrophenol2,6-Dibromo-3,4,5-trichlorophenol3,5-Dibromo-2,6-dichloro~4-chloro<br />

(bromo<br />

and iodo) phenol<br />

Tribromohydroquinone<br />

2,3,6-Tribromo-4-bromo<br />

(and chloro) phenol<br />

2-Chloro-4-bromo (and<br />

chloro)-3,5,6-tribromophenolTribromochlorohydroquinone<br />

2,4-Dichloro-6»nitro~<br />

phenol<br />

Hydroquinone<br />

Phenol<br />

p-Phenylenediamine<br />

2,3,5,6-Tetrabromo-<br />

4-chlorophenol<br />

Tribromohydroquinone<br />

dimethyl ether<br />

2-Bromo-4-chloro-6nitrophenol2,6-Dibromo-4-nitrophenol2,4-Dibromo-6-nitrophenol2,6-Dibromo-4-diazobenzene-1-oxide<br />

Oxidizing Agent<br />

HNO8<br />

Fuming HNO3<br />

Pb(OAc)2<br />

AgNO3<br />

K2Cr2O7 (H2SO4)<br />

K2Cr2O7 (H2SO4)<br />

K2Cr2O7, (H2SO4)<br />

HNO3 (sp. gr. 1.5)<br />

HNO3 (sp. gr. 1.5)<br />

Fuming HNO3<br />

Fuming HNO3<br />

Br2, H2O<br />

Fuming HNOs<br />

Fuming HNO3<br />

FeCl3 (ethanol)<br />

Fuming HNO 3<br />

Fuming HNO3<br />

K2Cr2O7 (H2SO4)<br />

Br2, H2O<br />

Br2, HNOs<br />

Br2, HNO3<br />

Br2, HNO3<br />

Fuming HNOs<br />

Fuming HNO 3<br />

Br2, H2O<br />

Br2, H2O<br />

Br2, H2O<br />

* References 152-247 are listed on pp. 336-338.<br />

t Concerning the structure of this quinone, see p. 310.<br />

Br2 (AcOH)<br />

Yield<br />

Poor<br />

—<br />

— Poor<br />

28%<br />

80%<br />

—<br />

—<br />

—<br />

—<br />

—<br />

—.<br />

—<br />

—<br />

—<br />

<br />

—<br />

—,<br />

32%<br />

69-71.5%<br />

—<br />

—<br />

—<br />

—<br />

98%<br />

Poor<br />

References*<br />

27 (y.), 120<br />

192<br />

193<br />

194<br />

149<br />

149<br />

88 (y.), 149<br />

195<br />

181<br />

188<br />

178<br />

28<br />

196<br />

197<br />

119<br />

178, 198<br />

197<br />

199<br />

28<br />

27, 200<br />

131<br />

132<br />

197<br />

128<br />

28<br />

201<br />

201<br />

207

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