Benzenes nitro

Vapours which can be readily condensed e.g., chloroform, aniline, nitro-benzene, etc.) are readily detected by the device shown in Fig. 5 i(b). It is essentially a cold finger with a deep indentation or weU at the lower end. In this way two or three drops of liquid can easily be collected and removed by a capillary tube for qualitative tests. 

Place 2 1 ml. (measured from a micro-burette) of nitro-benzene and 5 g. of granulated tin in a 150 ml. round-bottomed flask fitted with a small reflux water-condenser. (A large flask is employed because the mixture when subsequently boiled may bump violently.) Pour 10 ml. of cone. HCl down the condenser on this scale the reaction is not sufficiently vigorous to get out of control. Heat over a gauze for 15 minutes. Cool the flask and add a solution of 7 5 8- of NaOH in 10 ml. of water to redissolve the initial precipitate. Add about... 

Place 24 ml. (24 5 g.) of aniline, 13 ml. (15 5 g.) of nitro-benzene,t and 62 ml. (75 g.) of the anhydrous glycerol in the flask and mix thoroughly. (If the glycerol is still warm from the dehydration, cool the mixture in water.) Now add slowly 36 ml. (66 g.) of concentrated sulphuric acid, shaking the mixture thoroughly during the addition. The mixture at first... 

Disconnection b will not do as the nitio group is meta-directing and in any case nitro benzene wiU not react under FriedeTCrafts conditions. Disconnection a is fine as the MeO group is more powerfully ortho-direeting than the Me group (Ber., 1907, 3514). 

Chloramphenicol. Only chloramphenicol and a few closely related analogues fall iato this group. Chloramphenicol, a nitro benzene derivative of dichloroacetic acid, inhibits proteia biosyathesis. 

Nitro benzene C6H5NO, Production of aniline, para-aminophenol, and dyes... 

Cohn 1 instanced a similar phenomenon in the similarity of the odours of, benzaldehyde, nitro-benzene, benzonitrile, azimidobenzene, and phenyldi-imide. He developed the osmophore theory and introduced the terms kakosmophore and enosmophore to indicate those groups which impart an upleasant and a pleasant odour respectively. The kakosmophore groups are —... 

Whereas the production of arylnitrenes by the deoxygenation of nitrosobenzenes or nitro-benzenes by trivalent phosphorus reagents and their subsequent intramolecular ring expansion to 3//-azepines are well-known processes, the corresponding intermolecular reactions to form 1//-azepines have been exploited only on rare occasions and appear to be of little preparative value. For example, the highly electrophilic pentafluorophenylnitrene, obtained by deoxygenation of pentafluoronitrosobenzene with triethyl phosphite in benzene solution, produced a low yield (2-10%) of l-(pentafluorophenyl)-l//-azepine, which was isolated as its [4 + 2] cycloadduct with ethenetetracarbonitrile.169 With anisole as the substrate l-(pentafluorophenyl)-l//-azepin-2(3//)-one (16% bp 128 —130 C/0.4 Torr) was obtained. 

Design a plant to make 20,000 tonnes per annum of refined aniline by the hydrogenation of nitro-benzene. The total of on-stream operation time plus regeneration periods will be 7500 hours per year. 

Radical anions of tetracyanoethylene and trinitrobenzene have been observed on Ti02 and MgO. For nitro-benzene compounds adsorbed on well-degassed MgO, Tench and Nelson (90) reported spectra similar to those observed for the radical anions on alumina and silica-alumina. After discussing several possibilities for the source of electrons in MgO they suggested that some of the lattice oxide ions may act as electron donors. One of the difficulties with this proposal is the failure to detect the resulting... 

Figure 12.10 Pyrogram of acrylic emulsion paints containing different organic pigments (a) PR5 (b) PR112 (c) PR4 (d) PY3 (e) PR 251 (f) PY74. Peak assignments 1, EA 2, MMA 3, nBA 4, 4 chloro 2 nitro benzenamine 5, 2 chloro benzenamine 6, 1 chloro 2 isocya nato benzene 7, 2 methoxy 4 nitro benzenamine 8, 2 methoxy benzenamine 9, 1 isocya nato 2 methoxy benzene 10, 1 chloro 4 nitro benzenamine 11,1 chloro 2 nitro benzene 12, 2 naphthalenol 13, 3 amino 4 methoxy N,N diethyl benzenesulfonamide 14, 4 meth oxy N,N diethyl benzenesulfonamide 15, 5 chloro 2,4 demethoxy benzenamine 16, 2,4,5 trichloro benzenamine 17, 1,3,4 trichloro benzene 18, 2 methyl benzenamine 19,...

LOD and LOQ were measured to assess the sensitivity of the FID, ECD and TSD detectors for GC analysis of various nitroaromatic compounds. A parallel connection of the three detectors at the end of a single narrow-bore capillary column enabled direct comparison of the chromatograms. Structural effects on the response were evaluated and detection mechanisms were discussed. Recommendations were made for identification purposes and for analysis of environmental samples of nitro- and chloro-nitro-benzenes in a wide range of concentrations451. 

Dinitrobenzene. e 1 -Chloro-4-nitro-benzene. f l-Chloro-2,4-dinitrobenzene. 

This group covers aromatic nuclei bearing one nitro group most mono-nitro benzenes can be persuaded to detonate by a tetryl booster few are an immediate danger in tbe absence of other sources of energy. Calorimetric studies [1] suggest tbat nitroaiyl compounds decompose by an autocatalytic mechanism, and thus stability may depend upon thermal history. Individually indexed compounds are ... 

Details of nitrobenzene photochemistry reported by Testa are consistent with the proposal that the lowest triplet excited state is the reactive species. Photoreduction, as measured by disappearance quantum yields of nitrobenzene in 2-propanol is not very efficient = (1.14 0.08) 10 2 iD. On the other hand, the triplet yield of nitro benzene in benzene, as determined by the triplet-counting method of Lamola and Hammond 28) is 0.67 0.10 2). This raises the question of the cause of inefficiency in photoreduction. Whereas Lewis and Kasha 29) report the observation of nitrobenzene phosphorescence, no long-lived emission from carefully purified nitrobenzene could be detected by other authors i4,3o). Unfortunately, the hterature value of Et for nitrobenzene (60 kcal mole i) is thus based on an impurity emission and at best a value between 60 and 66 kcal mole can be envisaged from energy-transfer experiments... 

Synonyms AI3-16311 BRN 1907580 CCRIS 1224 EINECS 201-853-3 l-Methyl-2-nitro-benzene 2-Methylnitrobenzene o-Methylnitrobenzene o-Nitrotoluene 2-Nitrotoluol NSC 9577 ... 

Synonyms AI3-15394 BRN 1906911 CCRIS 2313 EINECS 202-808-0 l-Methyl-4-nitro-benzene 4-methylnitrobenzene p-Methylnitrobenzene NCI-C60537 p-Nitrotoluene 4-Nitro-toluol NCI-C60537 NSC 9579 PNT UN 1664. 

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