Resorcinol 2,4-dinitro

Raman spectroscopy metal in water complexes, 309 Rare earth complexes acetylacetone synthesis, 377 guanidinium, 282 hydroxamic acids, 506 Redox properties bipyridyl metal complexes, 90 Reductive coupling nitrile metal complexes, 265 Resorcinol, 2,4-dinitro-metal complexes, 273 Rhenium complexes acetylacetone, 376 synthesis, 375, 378... 

Trinitroresorcinol-dimethylether, almost col pltlts (from ale) or It-yel ndls (from ale), mp 124—25° sol in ale 81 eth prepd by nitrating 2,4-dinitro- 4,6-dinitro-resorcinol-dimethylether with HNOa coned H2S04 in the cold (Ref 7)... 

Among polyhydric phenols, only the nitro derivatives of resorcinol have gained considerable practical importance. The nitro derivatives of phloroglucinol may also be of some value. Both phenols have hydroxyl groups in the meta position to each other, thus enabling the introduction of three nitro groups. Among dinitro derivatives, those of pyrocatechol have found some uses. 

Tlje crude product was purified by dissolving in 5% NaOH solution and pouring the solution into hot boiling 12% sulphuric acid. The precipitated dinitro-resorcinol w as washed with water. The yield was 27.5 g, that is, ca. 40% of theoretical. 

Dinitro phenol Pentachlorophenol Resorcinol, Hydro-quinone, Pyrogallol Picric acid Aminoacids Buffer pH 4.6-4,8 HCOOH, CHsCOOH, C H COOH, C HgCOOH, Pivalic acid,... 

Dinitroresorcine (DNR) forms two isomers 2,4 and 4,6. Unlike in the nitration of some other aromatic molecules (toluene, phenol), it is possible to prepare practically pure dinitro isomers. The position of nitro groups in the ring depends on the reaction conditimis. The 2,4-isomer of DNR can be easily prepared by dinitrosatimi of resorcinol followed by alkaline oxidation of 2,4-dinitrosoresorcinol [8,14]. 2,4-DNR cannot be prepared by sulfonation of resorcinol followed by reaction with nitric acid (method used for phenol) because this method yields the trinitro compound. The 4,6-DNR isomer can be prepared in two ways (a) by nitration of 4,6-diacetylresorcinol and (b) directly by nitration of resorcinol using 98 % nitric acid at low temperatures (between —20 and —15 °C) [8],... 

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