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Updated: May 9, 2025
Its meythl ester, which can be formed from it, is codeine, one of the accompanying alkaloids of opium. Besides the methyl derivative, however, others are possible, and several have been recently prepared, giving rise to a class of artificial alkaloids known as codeines. Morphine, rapidly distilled over zinc dust, yields phenanthren, trimethyl-amine, pyrrol, pyridine, quinoline, and other bases.
Emetics, purgatives, and stimulants. Many of the synthetical coal-tar products now so largely employed as analgesics are powerful toxic agents. =Phenazone, Antipyrine, or Analgesin=, is a complex benzene derivative prepared from aniline, aceto-acetic ether, and methyl iodide. It is in colourless, inodorous, scaly crystals, which have a bitter taste. It is soluble in its own weight of water.
Proceed in the same way to transfer a second portion of the carbonate from the tube to another beaker of about the same size as the first. The beakers should be labeled and plainly marked to correspond with the entries in the notebook. Pour over the carbonate in each beaker about 80 cc. of water, stir until solution is complete, and add two drops of methyl orange solution.
Monomethyl and dimethyl aniline are colourless liquids prepared by heating aniline, aniline hydro-chloride and methyl alcohol in an autoclave at 220°. They are of great importance in the colour industry. Monomethyl aniline boils at 193-195°; dimethyl aniline at 192°.
Cave was so startled and so impressed by the absolute reality of these eyes that he drew his head back from the crystal to look behind it. He had become so absorbed in watching that he was quite surprised to find himself in the cool darkness of his little shop, with its familiar odour of methyl, mustiness, and decay. And as he blinked about him, the glowing crystal faded and went out.
No indicator is known which, like methyl orange, can be used within the solution, to show when the oxidation process is complete. Instead, an outside indicator solution is employed to which drops of the titrated solution are transferred for testing.
Solutions of the latter strength yield more accurate results when small percentages of acid or alkali are to be determined. These substances employed as indicators are usually organic compounds of complex structure and are closely allied to the dyestuffs in character. The indicators in most common use for acid and alkali titrations are methyl orange, litmus, and phenolphthalein.
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