Benzaldehyde, 2,4-dinitro

To a few drops of formalin solution add a few drops of dinitro-phenylhydrazine reagent A (p. 263) a yellow precipitate is produced in the cold. Acetaldehyde and acetone give orange-coloured precipitates. Dissolve water-insoluble compounds e.g-y benzaldehyde, salicylalde-hyde, acetophenone and benzophenone) in a small volume of methanol before adding reagent B. With benzophenone the precipitate forms slowly. 

Nitration using this reagent was first investigated, by Francis. He showed that benzene and some of its homologues bromobenzene, benzonitrile, benzoyl chloride, benzaldehyde and some related compounds, and phenol were mono-nitrated in solutions of benzoyl nitrate in carbon tetrachloride anilines would not react cleanly and a series of naphthols yielded dinitro compounds. Further work on the orientation of substitution associated this reagent with higher proportions of o-substitution than that brought about by nitric acid this point is discussed below ( 5.3.4). 

Auf diese Weise erhalt man innerhalb 12 Stdn. 0,197 g (70% d. Th.), innerhalb 24 Stdn. 0,232 g (82% d.Th.) Benzaldehyd-2,4-dinitro-phenylhydrazon, dessen Menge auch innerhalb 36 Stdn. konstant bleibt. 

Dimethoxy-benzaldehyd-2,4-dinitro-phenylhydrazon2 Einc Losung von 1,14 g (5,7 mMol)... 

The Ponzio reaction provides a useful route to gem-dinitro compounds and involves treating oximes with a solution of nitrogen dioxide or its dimer in diethyl ether or a chlorinated solvent. The Ponzio reaction works best for aromatic oximes where the synthesis of many substituted aryldinitromethanes have been reported. Compound (56), an isomer of TNT, is formed from the reaction of dinitrogen tetroxide with the oxime of benzaldehyde (55) followed by mononitration of the aromatic ring with mixed acid. Yields are usually much lower for aliphatic aldoximes and ketoximes. " The parent carbonyl compound of the oxime is usually the major by-product in these reactions. 

Benzaldehyde, 4-(l, l-dimethylethyl)-3-nitro Benzaldehyde, 4-(l, l-dimethylethyl)-3,5-dinitro Benzene, 2-(l,l-dimethylethyl)-4,5 dimethyl-1, 3-dinitro Benzoic acid, 4-(l,l-dimethylethyl)-2methyl 3,5-dinitro Benzene, l(l,l-dimethylethyl)-3,4-dimethyl-6- (lmethylethyl)-... 

Benzene, 2-ethyl-5-isooctyl-4-methoxy-l, 3-dinitro Benzene, l-isoheptyl-2-methoxy-4-methyl-3, 5-dinitro Benzene, l-isooctyl-2-methoxy-4-methyl-3, 5-dinitro Ethanone, 1- [3-(l,l-dimethylethyl)-2-methoxy-5-nitrophenyl Benzene, 1,3-dibromo-2-isopropyl-5-methoxy-4-nitro Benzene, 1,3-BIS- (1, l-dimethylethyl)-5-nitro Benzaldehyde, 5 (l,l-dimethylethyl)-2-methoxy-3-nitro Benzene, 1, 5-BIS- (1, l-dimethylethyl)-2 methoxy-4 methyl... 

Hydroxylamine konnen durch Oxidationsmittel zu Nitro-Verbindungen umgesetzt werden. So kann endo,endo-2,6-Dinitro-[4 peristylan durch Umsetzung von endo.endo-2,6-Bis-[hydroxylamino]-[4]peristylan mit Benzolsulfonsaure-benzylidenamid/Benzaldehyd fiber das Bis-nitron und dessen Oxidation mit Ozon in einer zweistufigen Reaktion her-gestellt werden3. 

Dinitro-3-hydroxybenzaldehyde gives dark crimson needles of 2,4,6-Trinitro-hydroxy-benzaldehyde- [4-nitro-phenylhydrazone], 02NC6H4NN CC6H(N02)3 0H which explode at 228-30°. Its p-Bromophenylhydrazone, deep olive green crystals with a metallic luster, also explodes violently at 218-20°. The p-nitro-phenylhydrazone derived from 2,6-dinitrohydroxy-benzaldehyde, deep terra cotta crystals, explodes at 240-42°, but the corresponding p-bromophenyl-... 

N,N -D ime thy 1-4,6-dinitro-m-pbenylenedia-mine, (02N)2CeH2(NH.CH3)2 yel ndls (from acet), mp >290° (dec) obtd with other products by warming 5-chloro-l,2,4-trinitro-benzene or 5 bromo- deriv with ca 4 moles of benzaldehyde-methylimide in MeOH (Refs 4 7)... 

OHC.CeH2(NOz)2.N( N).Cl mw 258.58, N 21.67% It yel ppt mp expl on heating without melting readily sol in w insol in common org solvs. Can be prepd from 2, 6-dinitro-4-amino-benzaldehyde-cxime in abs ale and HC1 by reaction with amyl nitrite. Other props are given in Refs 1 2... 

Barbituric acid, 32, 7 Benzaldehyde, 30,100 Benzaldehyde, amino, 31, 6 Benzamidine, N,N -diphenyl-, 31, 48 Benzanilide, 31, 48 Benzene, 31, 88 32, 10 Benzene (cHLORO-fert-BUTYL)-, 32, 90 Benzene, 2-chloro-1,3-dinitro-, 32,23 ETHYNYL-, 30, 72... 

Benzaldehyd 2,6-Dinitro-3,4,5-trimethyl- E3, 240 (CH3 - CHO) Benzoesaure 3-Nitro- -methox-imid-Essigsaure-Anhydrid E5, 830 (Ar-CO-NH-OR +... 

Dinitro-3-hydroxybenzaldehyde gives dark crimson needles of 2,4,6-Trinitro-hydroxy-benzaldehyde- [4-nitro-phenylhydrazone],... 

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