
Nitrosobenzene is the organic compound with the formula C6H5NO. The compound can be viewed as hybrid of singlet O2 and azobenzene. This diamagnetic species exists in equilibrium with its dimer. ==Preparation== Nitrosobenzene was first prepared by Adolf von Baeyer by the reaction of diphenylmercury and nitrosyl bromide: The modern synthesis entails...
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http://en.wikipedia.org/wiki/Nitrosobenzene

(from the article `spectroscopy`) ...can be shifted by the substitution of various organic groups for one or more of the hydrogen atoms attached to the carbon ring. The substitution ...
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http://www.britannica.com/eb/a-z/n/45

a blue, crystalline, water-insoluble solid, CHNO, that is green as a molten solid or in solution.
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https://www.infoplease.com/dictionary/nitrosobenzene
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