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Barbital
Barbital (as known in the United States) or barbitone (as known elsewhere), marketed under the brand names Veronal for the pure acid and Medinal for the sodium salt, was the first commercially available barbiturate. It was used as a sleeping aid (hypnotic) from 1903 until the mid-1950s. The chemical names for barbitone are diethylmalonyl urea or diethylbarbituric acid; hence, the sodium salt (known as medinal, a genericised trademark in the United Kingdom) is known also as sodium diethylbarbiturate.
== Synthesis ==
Barbitone was first synthesized in 1902 by German chemists Emil Fischer and Joseph von Mering, who published their discovery in 1903. Barbitone was prepared by condensing diethylmalonic ester with urea in the presence of sodium ethoxide, and then by adding at least two molar equivalents of ethyl iodide to the silver salt of malonylurea or possibly to a basic solution of the acid. The result was an odorless, slightly bitter, white crystalline powder.
Barbitone can also be synthesized in a condensation reaction from urea and diethyl-2,2-diethylmalonate, a diethyl malonate derivative:
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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