أكتوبر 23rd, 2018

 

Autoxidation

Autoxidation The slow, flameless combustion of materials by reaction with oxy­gen; it is sometimes spelled autooxidation. Autoxidation is important because it is a useful reaction for converting compounds to oxygenated derivatives, and also because it occurs in situations where it is not desired (as in the destructive cracking of the rubber in automobile tires).

Although virtually all types of organic materials can undergo air oxidation, certain types are…

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Atropine

Atropine An alkaloid, C17H23NO3, with the chemical structure below. The sys­tematic chemical name is endo-(±)-a-(hydroxymethyl) phenylacetic acid 8-methyl- 8-azabicyclooct-3-yl ester, and in phamacy it is sometimes known as dl­hyoscyamine. It occurs in minute amounts in the leaves of Atropa belladonna, A. betica, Datura stramonium, D. innoxia, and D. sanguinea, as well as many related plants. It is chiefly manufactured by racemization of 1-hyoscyamine, which is isolated from the…

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Atomic structure and spectra

Atomic structure and spectra The idea that matter is subdivided into discrete and further indivisible building blocks called atoms dates back to the Greek philosopher Democritus, whose teachings of the 5th century B.C. are commonly ac­cepted as the earliest authenticated ones concerning what has come to be called atom­ism by students of Greek philosophy. The weaving of the philosophical thread of atom­ism into the analytical fabric of physics…

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