Di azonium salts

This preparation, specifically of acylated aryl thioglycosides, is carried out by reaction of, for instance, a 2,3,4,6-tetra-O-acety 1-1 -thio-P-D-glucopyranose with a di-azonium salt, followed by thermal decomposition of the intermediate diazo product. 

Figure 10. Synthesis of the 1,2- and 3,4-dihydrodiols of phen-anthrene from the related phenols by Method IV (47). Reagents (i) (KSO ) NO or (PhSe0>20 (ii) LiAlH or NaBH,, 0 (iii) di-azonium salt of sulfanilic acid (iv) Na O S (vJ (JrO. ...

The published research on the photochemical decomposition of di-azonium salts suggests that the two processes, a heterocyclic and a homolytic process, analogous to those of the thermal decomposition may occur. Various workers 36 187 have reported that phenols are formed when diazonium salts are photolyzed in water and aryl ethers result when an alcohol replaces water as the solvent. Homer and Stohr122 report that a process analogous to reductive deamination occurs in preference to ether formation results in alcohols. The importance of free radical intermediates in the photodecomposition, based on magnetic susceptibility measurements, has been stressed.25 Lee and his co-workers171 have recently suggested that in ethanol the photodecomposition of a diazonium salt occurs via a radical intermediate while in water an ionic process predominates. Thus, photodecomposition of a nitrobenzene diazonium chloride in water yielded both a nitrophenol and a chloronitrobenzene in ethanol, on the other hand, the major product of photolysis was the reduction product, nitrobenzene. 

Dinitro-l, 3 dimethylbenzene, col crysts, becoming yel in the light (from ale), mp 101° prepd by diazotizing 2,5 dinitro-2-amino-l,3 dimethylbenzene and heating, the di-azonium salt in ale (Ref 1, p380 Ref 3, p295)... 

CHEMICAL PROPERTIES Non-flammable decomposes on heating formation of di-azonium salts and alkyl derivatives FP (not available) AT (not available) LFL (not available) UFL (not available). 

CHEMICAL PROPERTIES nonflammable decomposes on heating formation of di-azonium salts and alkali derivatives weak base... 

When sodium nitrite (NaN02) is treated with acid, nitrous acid (HNO2) is produced. This is the reagent in the mixture that converts the aniline derivative to its di-azonium salt. In this case ... 

Tri nitrobenzene I di azonium Hydroxide, (°2N)3C6H2.N2.°H-, mw 257.12, N 27.24%. Some salts were prepd but their expl props were not reported... 

OH] 2 mw 166.14, N 33-73%. Salts of both the 1,3-and 1,4-isomers have been prepd, some of which are expl. Salts of Benzene-bis-( 1,3-di-azonium hydroxide) Chloride, C6H4(N2.Cl)2,yel crysts, very expl Sa//ate,CsH4(N,.O.SO,H) ... 

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