Nitro structure

Furan, 2,3-dihydro-5-methyl-polymers, 1, 276 Furan, 2,3-dihydro-3-methylene- H NMR, 4, 577 Furan, 2,5-dihydro-2-methylene- H NMR, 4, 577 tautomerism aromaticity and, 4, 595 Furan, 2,5-dihydro-2-nitro-structure, 4, 550 Furan, 2,3-dihydroxy-tautomerism, 4, 37 Furan, 2,4-dihydroxy-tautomerism, 4, 37 Furan, 3,4-dihydroxy-tautomerism, 4, 37 Furan, 2,5-diiodo-nitration, 4, 602 synthesis, 4, 712 Furan, 3,4-diiodo-reactions, 4, 650 Furan, 2,3-dimethoxy-synthesis, 4, 625, 648 Furan, 2,5-dimethoxy-synthesis, 4, 648 Furan, 3,4-dimethoxy-cycloaddition reactions, 4, 64, 625 lithiation, 4, 651 reactions... 

On the other hand, Elliott and his co-workers 4 maintain that the evidence for the nitro- structure is unsatisfactory, and that the p-nitro-dimethylaniline produced with dimethylaniline is a secondary product obtained either by oxidation of the nitroso-compound or by direct nitration of the amine. The addition of ethyl hydrogen sulphate to a solution of nitrosulphonic acid in sulphuric acid does not yield nitro -ethane. Elliott suggests that the crystalline acid is essentially the nitroso- form, ON. O. SO 2. OH, but that in the molten condition and in sulphuric acid solution this form is in equilibrium with another of yO ... 

This is the structure assigned by chem. Abs. to the claimed benzotriazolium 1-nitro-imidate above. The editor suspects they are right and that the nitroamine structure should also be considered for the 2- isomer. The uc/ -nitro structures are also possible. See Benzotriazolium 1-nitroimidate See also N—NITRO COMPOUNDS... 

Electron attracting substituents in the nearest vicinity to the nitro group tend to increase the screening constant for the latter. Nitrogen chemical shifts differentiate clearly nitroalkanes> nitroaromatics, Af-nitro and 0-nitro groups. They are also helpful in distinguishing between the true nitro structure and that of an aci-nitro compound ... 

There is no information on the exact mechanism of toxicity of quintozene. The aromatic nitro structure of quintozene and the aromatic amine structure of its main metabolite PCA, however, are the common parent structures of known methemoglobinemic agents. Hexachlorobenzene is a major contaminant in the technical material, which may be accountable for some aspects of quintozene s toxicity. 

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