Nitrosylsulfuric Acid Research Articles

Modellreaktionen zur Plumbagin-Synthese, 2. Mitteilung 5-Amino-1-naphthol als Startkomponente / Model Reactions for Plumbagin Synthesis, 2nd Communication 5-Amino-1-naphthol as Starting Compound

Abstract The aminomethylation of 5-amino-1-naphthol (1) and 5-acetamido-1-naphthol (9) is examined. While the hydrogenolysis of the phenol Mannich bases derived from 1 cannot be accomplished, the derivatives of 9 react easily. The oxidation of the 2-methylphenol compounds 5 and 18 to the corresponding quinones may performed with Fremy's salt. The following transforming of the amino to the hydroxy group by nitrosylsulfuric acid succeeds with small yield only.

Chemical composition of venus clouds

From estimates of drying effect in the cloud layer, data of the Venera 14 X-ray fluorescent spectroscopy, and evaluation of photochemical production of sulfuric acid, it follows that sulfuric acid and/or products of its further conversion should constitute not only the Mode 2 particles but most of the Mode 3 particles as well. The eddy mixing coefficient equals 2 × 10 4 cm 2 s −1 in the cloud layer. The presence of ferric chloride in the cloud layer is indicated by the Venus u.v. absorption spectrum in the range of 3200–5000 Å, by the Venera 12 X-ray fluorescent spectrum, by the coincidence of the calculated FeCl 3 condensate density profile and that of the Mode 1 in the middle and lower cloud layer, as well as by the upward flux of FeCl 3 from the middle cloud layer which provides the necessary concentration of FeCl 3 in H 2SO 4 solution. FeCl 3 as the second absorber explains the localization of absorption in the upper cloud layer due to the FeCl 3 conversion to ferric sulfate near the boundary between the upper and middle cloud layers. Other possible absorbers such as sulfur, ammonium pyrosulfite, nitrosylsulfuric acid, etc. are discussed.

ChemInform Abstract: Nitrosylsulfuric Acid ‐ a Versatile Intermediate (or Saying YES to Lambson′s Nitrosyl Ion)

ChemInform Abstract: Nitrosylsulfuric Acid ‐ a Versatile Intermediate (or Saying YES to Lambson′s Nitrosyl Ion)

ChemInform Abstract: NITROSYLSULFURIC ACID HYDROLYSIS OF PRIMARY AMIDES

Chemischer InformationsdienstVolume 14, Issue 10 Isocyclic Compounds ChemInform Abstract: NITROSYLSULFURIC ACID HYDROLYSIS OF PRIMARY AMIDES L. G. JUN. WADE, L. G. JUN. WADESearch for more papers by this authorW. B. SILVEY, W. B. SILVEYSearch for more papers by this author L. G. JUN. WADE, L. G. JUN. WADESearch for more papers by this authorW. B. SILVEY, W. B. SILVEYSearch for more papers by this author First published: March 8, 1983 https://doi.org/10.1002/chin.198310190Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume14, Issue10March 8, 1983 RelatedInformation

The clouds of Venus: Sulfuric acid by the lead chamber process

Abstract The Pioneer Venus atmospheric probe provided new data on the louds of Venus. A model consistent with this data involves SO 2 being oxidized to H 2 SO 4 by NO x in the presence of H 2 O. NO x also forms nitrosylsulfuric acid (NOHSO 4 ) dissolved in the H 2 SO 4 droplets. This acid solution, along with SO 2 and perhaps NO 2 , can explain the uv and visible reflection spectrum of Venus. In the middle and lower clouds NOHSO 4 forms solid particles.

Ring transformations of 4H‐pyrans. Pyridines from 2‐amino‐4H‐pyrans

AbstractRing transformations of 4H‐pyrans into pyridines are reported. Treatment of 2‐amino‐4,6‐diaryl‐3,5‐dicyano‐4H‐pyrans (I) with nitrosylsulfuric acid brings about their transformation into 3,5‐dicyano‐4,6‐diaryl‐2‐pyridones (VI) which can also be obtained from α‐benzoylcinnamonitriles (IX) and cyanoacetamide. Similarly, 2‐amino‐4,6‐diaryl‐5‐carbethoxy‐3‐cyano‐4H‐pyrans (II) lead to 4,6‐diaryl‐5‐carbethoxy‐3‐cyano‐2‐pyridones (VII). Treatment of both series of pyrans with sulfuric acid results in the formation of the corresponding 3,4‐dihydro‐2‐pyridones (IV and V). Reaction of pyrans II with ammonium acetate in acetic acid yields 2‐amino‐4,6‐diaryl‐5‐carbethoxy‐3‐cyanopyridines (XII). Pyrans I undergo an entirely different type of reaction upon treatment with this reagent leading to 2,4,6‐triaryl‐3,5‐dicyano‐1,4‐dihydropyridines (XV).

Nitrogen‐sulfur compounds in stratospheric aerosols

Two forms of nitrosyl sulfuric acid (NOHSO4 and NOHS2O7) have been tentatively identified in stratospheric aerosols. The first of these can be formed either directly from gas reactions of NO2 with SO2 or by gas‐particle interactions between NO2 and H2SO4. The second product may form when SO3 is involved. Estimates based on these reactions suggest that the maximum quantity of NO that might be absorbed in stratospheric aerosols could vary from one‐third to twice the amount of NO in the surrounding air. If these reactions occur in the stratosphere, then a mechanism exists for removing nitrogen oxides from that region by aerosol particle fallout. This process may typify another natural means that helps cleanse the lower stratosphere of excessive pollutants.

Mixed anhydrides of cyclohexanecarboxylic acid with sulphonic acids

A new high-yield synthesis of mixed anhydrides of cyclohexanecarboxylic acid with sulphonic acids is described. The intramolecular thermal decomposition of these anhydrides when treated with solutions of nitrosylsulphuric acid in sulphuric acid may be assumed to proceed via pentamethyleneketen which has been recently postulated to be an intermediate in the SNIA Viscosa process for preparing Iµ-caprolactam.

Reactions of 1,2‐Dimethyl‐5‐nitroimidazole, novel methods of conversion of the 2‐Methyl group to a nitrile

Abstract1, 2‐Dimethyl‐5‐nitroimidazole(1)and N,N‐dimethylformamide dicyclohexylacetal gave the 2‐(β‐dimethylaminovinyl) analog 2 and with iodine and pyridine gave the 2‐(1‐pyridinium)methyl compound 3. Benzoyl chloride‐triethylamine and 1 led to benzoylation of the 2‐methyl group to give ketone 9 as the enol benzoate. Nitrous acid or nitrosylsulfuric acid with 9 or its enol ester afforded the oximinoketone 10 which was cleaved with thionyl chloride to give 2‐cyano‐1‐methyl‐5‐nitroimidazole (11) in high overall yield. 1‐Ethyl‐2‐methylbenzimidazole (22) was converted to 2‐cyano‐1‐ethylbenzimidazole (25) similarly. Reaction of 1 with ethyl oxalyl chloride and triethylamine afforded ethyl 1‐methyl‐5‐nitro‐2‐imidazolepyruvate (19) as the enol oxalate. Nitrous acid and 19 gave the oximino pyruvate 20 which effervesced on mild heating to give 2‐cyano‐1‐methyl‐5‐nitroimidazole (11). The preparation of 1‐methyl‐5‐nitro‐2‐imidazoleacetonitrile (39) is reported.

Synthesis of 4,4-diphenyl-7-oxodibenzodihydro-1,4-diazepinium salts

The salt of a new completely aromatic ammonium cation, namely 4, 4-diphenyl-7-oxodibenzo-1, 4-dihydrodiazepinium iodide, was obtained, the structure of which was confirmed by qualitative tests with silver hydroxide, aqueous NaOH solution, and nitrosylsulfuric acid.

Diazotization of Tetrafluoroanthranilic Acid and Several Reactions of Related Compounds

Abstract Diazotization of tetrafluoroanthranilic acid with nitrosylsulfuric acid in acetic acid gave a ring-hydroxylated, stable diazonium salt 4, which was isolated in high yield. Several reactions on this diazo compound were carried out. Replacement of the diazonium group with hydrogen, chlorine, or bromine was accomplished with the usual reagents. The reaction of diazo compound with diazomethane afforded a benzoxadiazine compound 13. Other related polyfluoroaromatic compounds were prepared.

A facile synthesis of 2,3‐dihydroimidazo‐ and 1,2,3,4‐tetrahydropyrirnido[1,2‐f] phenanthridines

AbstractWhen 6‐(2‐hydroxyethyl)amino‐(1), 6‐(3‐hydroxypropyl)amino‐(2),or 6‐[2‐(1‐hydroxybutyl)]‐aminophenanthridines (3), dissolved in concentrated sulfuric acid, were treated with nitrosylsulfuric acid at 0–25, then diluted with water and basified with aqueous sodium hydroxide at 65–86°, 2,3‐dihydroimidazo‐ (4a‐i), 1,2,3,4‐tetrahydropyrimido‐ (5), or 2,3‐dihydro‐2‐ethyl‐imidazo[1,2‐f]phenanthridines (4j‐p) were obtained respectively in good yields. Structures were substantiated by ir spectroscopy. The 6‐ω‐hydroxyalkylaminophenanthridines were prepared from the corresponding 6‐chlorophenanthridines. A possible mechanism for the formation of these ring systems is postulated.

Studies of benzimidazole derivatives

It was found that the formation of 2,5′- and 2, 6′-azobenzimidazoles, formed during the action of nitrosyl sulfuric acid on 2-amino-2-alkyl (phenyl, benzyl) benzimidazoles, occurs by azo combination of the extremely active salt of benzimidazole-2-diazonium obtained at first with the original amine. The azo compound is formed from 2-aminobenzimidazole substituted in position 5 and 6 only in the presence of 2-dimethylamino-1-methylbenzimidazole or other azo constituents. In the presence of substitutes, which hinder azo combination, 2,2′-diazoaminobenzimidazoles stable also in strongly acid medium may constitute the product of the reaction.

Nitrosation of thebaine leading to 7-substituted neopinone derivatives.

Nitrosation of thebaine hydrochloride with nitrosyl chloride or pentyl nitrite in methanol or ethanol has been shown to give 7-hydroxyiminoneopinone dimethyl or diethyl acetal. Other, bimolecular, products, best prepared by use of nitrosylsulphuric acid as nitrosating agent, arise via Diels–Alder addition of a transient 7-nitrosoneopinone derivative to a second molecule of thebaine.

Studies of the acylarylnitrosamine reaction. I. The use of nitrosylsulfuric acid in the preparation of unsymmetrical biaryls

Nitrosylsulfuric acid, which is very easy to prepare in a pure state and is quite stable at room temperature, has been found to be a very suitable reagent for the nitrosation of acylarylamines. The nitroso derivatives can be isolated easily, and on decomposition in benzene have yielded unsymmetrical biaryls in improved yields. Some of the nitrosations that could not be achieved earlier have now been accomplished successfully by this method.

The Diazotisation of Aniline and of the Chloroanilines in Dilute Sulphuric Acid Solutions: A Kinetic Study

AbstractThe rate of diazotisation of aniline, o‐, m‐, and p‐, chloroaniline, in 0.1 mol/l sulphuric acid, was determined at different temperatures. The values of the specific reaction rate, free energy, enthalpy, entropy, and energy, of activation, for the rate‐determining reaction, viz, the nitrosation of the free amine by nitrosyl sulphuric acid, were calculated and compared. Relations were drawn between each of the specific reaction rate, and the free energy of activation, for the rate‐determining reaction, and base strength. The effect of the chlorine atom, in the different positions of the benzene nucleus, of the chloroanilines, on the reaction rate, is discussed.

A kinetic study of the diazotization of aniline in dilute sulphuric acid

AbstractThe results of kinetic measurements of the diazotization of aniline in 0.1 mol/l sulphuric acid, were combined with equilibrium data of the dissociation of the anilinium ion, and of nitrosyl—sulphuric acid. The specific rates for the rate‐determining reaction, and the quantities ΔG≠, ΔH≠ and ΔS≠ were calculated. These were compared with the corresponding data for the nitrosation of aniline by nitrosyl chloride. From the values of k′, of the activation energy, and of ΔH≠, it was concluded that the diffusion of the reactants is of importance as a rate‐determining process.

532. Reaction of nitrosylsulphuric acid with olefins

The first page of this article is displayed as the abstract.

New Allied plant for nitrosyl sulfuric acid now on stream in Buffalo

New Allied plant for nitrosyl sulfuric acid now on stream in Buffalo

New Allied plant for nitrosyl sulfuric acid now on stream in Buffalo

New Allied plant for nitrosyl sulfuric acid now on stream in Buffalo