Fundamental Organic Chemistry
Fundamental Organic Chemistry
Fundamental Organic Chemistry
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OH<br />
3-α-Naphthol<br />
Solid, insoluble in water, alcohol, ether and sod.hydroxide solution.<br />
Test<br />
1-Ferric chloride test:<br />
Diluted solution of α-naphthol in alcohol then add<br />
2 drop of FeCl 3 .<br />
2-Azodye formation test:<br />
Take 3 test tube<br />
Tube (1): 1ml of aniline +3.5ml of conc. HCl<br />
Tube (2): 1ml of sodium nitrite NaNO 2<br />
Tube (3): α-naphthol dissolved in excess NaOH.<br />
Keep the 3 test tube in ice bath& Put tube (2) (1)<br />
slowly, then add mixture to tube (3) .<br />
3-Chloroform test :<br />
1ml of α-naphthol dissolved in excess 20% NaOH<br />
+1ml of chloroform CHCl 3 then heat in water bath<br />
Observation<br />
Greenish color<br />
turns to violet<br />
Brownish red<br />
ppt.<br />
Blue color turns<br />
to green<br />
Result<br />
The compound<br />
from phenols<br />
Dye is<br />
Benzene azo<br />
α-naphthol<br />
Compound is<br />
α-naphthol<br />
4-Phethalein test:<br />
In dry test tube add 0.5gm of α-naphthol<br />
+ 0.5 gm of phthalic anhydride +2drop of<br />
conc.H 2 SO 4 , and gently fuse together allow to cool ,<br />
and then add 30% NaOH solution in excess .<br />
Green Color<br />
Compound is<br />
α-naphthol<br />
73
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