diazonium

In addition to these alkali ions and other metal ions, it has been possible to produce host molecules that bind organic positive ions (cations such as diazonium and alkylammonium ions), as well as other host molecules which can bind small neutral molecules or negative ions

Press Release: The 1987 Nobel Prize in Chemistry 1987

C_6H_5·N_2·C_6H_3 (NH_2) _2, first prepared by O. Witt (_Ber. _, 1877, 10, p. 656), is obtained by coupling phenyl diazonium chloride with meta-phenylene diamine.

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-- The oxyazo compounds are prepared by adding a solution of a diazonium salt to a cold slightly alkaline solution of a phenol.

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_ -- The diazo-amines, R·N: N·NHR_1, are obtained by the action of primary amines on diazonium salts; by the action of nitrous acid on a free primary amine, an iso-diazohydroxide being formed as an intermediate product which then condenses with the amine; and by the action of nitrosamines on primary amines.

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Alkylated amino-azo-benzenes are also known, and are formed by the coupling of diazonium salts with alkylated amines, provided they contain a free para position with respect to the amino group.

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Th. Zincke found that the products obtained by coupling a diazonium salt with [alpha] - naphthol, and by condensing phenyl-hydrazine with

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The most easily obtained mixed azo compounds are those formed by the union of a diazonium salt with the potassium or sodium salt of a nitroparaffin (V. Meyer, _Ber. _, 1876, 9, p. 384):

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Noyori asymmetric hydrogenation is the asymmetric reduction of β-keto-esters Amines can be converted to diazonium salts which are then hydrolyzed.

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It would be ironic if courts, seeing opposing expert witnesses giving odds of correct identification differing a million-fold (105: 1 versus 1011: 1), were to decide that DNA evidence is hopelessly unreliable, and turn instead to eye-witness identification (odds of correct identification diazonium salt -- couples to enzyme tyrosine groups

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It may be prepared by the action of ammonia on diazobenzene perbromide; by the action of hydroxylamine on a diazonium sulphate (K. Heumann and L. Oeconomides,

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