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A Manual of the Chemistry of the Carbon Compounds

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468 THE 0REMI8TRY OF<br />

It forms a sulphonic acid with fuming sulphuric acid, and by adding<br />

potash to a solution <strong>of</strong> pyridine-ethylammonium hydroxide a red<br />

body is gradually formed, dyeing a beautiful red shade on silk.<br />

Sodium converts pyridine into bases which are richer iu hydrogen,<br />

and into dipyridine (^H^Ng, which forms colourless crystals melting<br />

at 108°. It yields crystallizable salts, and is not acted on by concentrated<br />

nitric acid.<br />

Picoline CgH^N is a liquid resembling pyridine, and boiling at 135°.<br />

It has been obtained artificially by <strong>the</strong> dry distillation <strong>of</strong> aoroleinammonia:—<br />

C0H,,N0 = CaH7N + HaO<br />

and by heating propenyl tribromide with alcoholic ammonia; first<br />

dimonobromaUylamine is formed, which by <strong>the</strong> fur<strong>the</strong>r action <strong>of</strong> ammonia<br />

is converted into picoline :—<br />

C0H9Br2N = C8H7N + 2HBr<br />

Zutidim C.ILN is a liquid resembling picoline, and boils at 154°.<br />

a powerful odour.<br />

hyde-ammonia wit<br />

acetaldehyde is probably first converted into erotonaldehyde, which is<br />

<strong>the</strong>n transformed into eollidine:—<br />

2C4HflO2 + NH, = C8HUN + 2H20<br />

The same base has been obtained by heating ethidene dibromide<br />

with aqueous ammonia to 160°.<br />

The o<strong>the</strong>r bases belonging to this group are also liquids possessing<br />

a strong odour; <strong>the</strong>ir constitution is not definitely known, but <strong>the</strong>y<br />

contain <strong>the</strong> nitrogen only combined with carbon, and <strong>the</strong> carbonatoms<br />

probably linked toge<strong>the</strong>r in a closed chain; this appears <strong>the</strong><br />

more probable as pyridine has been obtained from naphthalene, and<br />

<strong>the</strong> constitution <strong>of</strong> <strong>the</strong> first member appears to be <strong>the</strong> following:—<br />

CH<br />

H

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