20.2 Outline a procedure for separating a mixture
20.2 Outline a procedure for separating a mixture
20.2 Outline a procedure for separating a mixture
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Step1<br />
H SO HNO<br />
2N 3H 2 +N2 SO3H Step2<br />
OH<br />
+<br />
+N2 SO3H NaOH<br />
H2O OH<br />
N N<br />
SO3 - Na +<br />
20.16 Butter yellow is a dye once used to color margarine. It has since been shown to be<br />
carcinogenic, and its use in food is no longer permitted. <strong>Outline</strong> a synthesis of butter yellow from<br />
benzene and N, N-dimethylaniline.<br />
N(CH3) 2<br />
Answer:<br />
N(CH 3) 2<br />
CH 3COO - Na +<br />
N N<br />
Butter yellow<br />
HNO3<br />
H 2SO 4<br />
NO 2<br />
N N<br />
Fe<br />
H 3O +<br />
N(CH3)2<br />
NH2 HNO2<br />
20.17 Azo compounds can be reduced to amines by a variety of reagents including stannous<br />
chloride (SnCl2).<br />
SnCl2 Ar N N Ar' ArNH2 + Ar'NH2 This reduction can be useful in synthesis as the following example shows:<br />
4-Ethoxyaniline<br />
SnCl 2<br />
(1) HONO,H 3O +<br />
(2)phenol,OH -<br />
NN +<br />
A(C 14H 14N 2O 2) NaOH,CH 3CH 2Br B(C16H 18N 2O 2)<br />
two molar equivalents of C (C8H11NO) acetic anhydride phenacetin(C10H13NO2) Give a structure <strong>for</strong> phenacetin and <strong>for</strong> the intermediates A,B,C. (Phenacetin, <strong>for</strong>merly used as an
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