Cyanogen CAS

Economic Aspects. Malononitrile of minimum 99% purity was available as a soHdifted melt for ca 30/kg in 1993 for ton quantities. Malononitrile is produced by Lon2a Ltd. (Swit2edand) using the cyanogen chloride process. 

The photolytic and thermolytic decomposition of azides in the presence of olefins has been applied to aziridine synthesis. However, only a limited number of steroid aziridines have been prepared in this manner. The patent literature reports the use of cyanogen azide at ca. 50° for 24 hours in ethyl acetate for the preparation of an A-nor- and a B-norsteroidal aziridine. The addition is believed to proceed via a triazoline. The reaction of cholest-2-ene with ethyl azidoformate takes place in a nonselective manner to produce a mixture of substances, including C—H insertion products. 

The major fragmentation in mass spectra of 1,2,5-oxadiazoles is attributed to the loss of nitrile and nitrile oxide or expulsion of NO. The conversion of 3,4-dicyano-l,2,5-oxadiazole-2-oxide (3,4-dicyanofuroxan) 10 to cyanogen iV-oxide 11 (Equation 5) was investigated under the conditions of collisional activation (CA) and neutralization-reionization (NR) mass spectrometry. Flash vacuum thermolysis mass-spectrometry (FVT-MS) and flash vacuum thermolysis infra-red (FVT-IR) investigations of furoxans 10, 12, and 13 reveal that small amounts of cyano isocyanate accompany the formation of the main thermolysis product 11 <2000J(P2)473>. 

N 51-84% red-orn crysts (from w at 60°), mp explodes ca 99° without leaving a residue sol in hot w with slow decompn insol in org sol vs. This compd was obtained, in addn to other products, by Wieland (Ref 2) on carefully treating with HNOj the alkaline soln of dihydroxyguanidine hydrobromide, HO-NH-C( NH)-NH-OH, HBr. The latter compd was prepd by reacting at —20° cyanogen bromide and hydroxylamine dissolved in a mixt of methyl ale and anhyd eth. The reaction between cyanogen bromide and free hydroxylamine in alcoholic ethereal soln at RT is violent and almost expl... 

Koppers CAS [Cyanogen, Ammonia, Sulfur] A scrubbing process for removing hydrogen cyanide, ammonia, and hydrogen sulfide from coal gas using a polythionate solution. Described in 1945 but probably never commercialized. 

Oxalyl chloride yields COCl radicals on photolysis and this reaction has been used to directly substitute alkanes with the chloroacyl group (equation 30). Similarly, biacetyl reacts with alkanes in a benzoyl peroxide-initiated chain reaction to give ketones in ca. 60-70% yield (equation Cyanogen... 

Cyanogen and ca-bromoacetophenone give di-imino-dihydroquimxaline and a phenyl-dihydroquinoxaline respectively. If the diketones are replaced by monocarbonyl compounds such as aldol, crotonie aldehyde, benzaldehyde, o- and p-anisaldehydes or iiiperonal, arsenated Schiff s bases result, e.g. 

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