Search results for " ammonia"
showing 10 items of 40 documents
Über die polymerisation von acrylsäurechlorid
1960
Monomeres Acrylsaurechlorid wird mittels Azodiisobuttersaurenitril in Dioxan bei 50°C polymerisiert. Bei Ausschlus von Feuchtigkeit und Sauerstoff entstehen bis zu 90% Umsatz unvernetzte Polymere. Durch Reaktion mit flussigem Ammoniak wurden Polyacrylamide erhalten, die zur viskosimetrischen Molgewichtsbestimmung dienten. Monomeric acrylyl chloride was polymerized in dioxane at 50°C by azo-bis-isobutyronitrile. With the exclusion of moisture and oxygen, a non-cross-linked polymer with a 90% yield was obtained. Polyacrylamides were formed by the reaction of polyacrylyl chloride with liquid ammonia. These products were used for viscosimetric molecular weight determinations.
Eine neue Synthese von Imidazolderivaten. 1. Mitt.: Zur Darstellung 2-substituierter Imidazol-4-alkohole
1973
2-Substituierte Imidazol-4-alkohole (3) lassen sich aus Alkyl- oder Aryliminoestern (1) und α-Hydroxyketonen (2) in flussigem Ammoniak unter Druck mit guten Ausbeuten darstellen. A New Synthesis of Imidazole Derivatives The 2-substituted imidazole-4-alcohols (3) are obtained from alkyl- or aryl-iminoesters (1) and α-hydroxy-ketones (2) in liquid ammonia under pressure in good yields.
N-Substituierte Imidazole aus Aldehyden, 1,2-Diketonen, primären Aminen und flüssigem Ammoniak. 4. Mitt. über Imidazolsynthesen mit flüssigem Ammoniak
1974
N-substituierte Imidazole 5 konnen aus Aldehyden 1, 1,2-Diketonen 2 und primaren Aminen 3 in flussigem Ammoniak 4 dargestellt werden. N-substituted Imidazoles from Aldehydes, 1,2-Diketones, Primary Amines and Liquid Ammonia N-substituted imidazoles 5 can be synthesized from aldehydes 1, 1,2-diketones 2 and primary amines 3 in liquid ammonia 4.
Imidazol-4-carbinole aus Iminoestern und Dihydroxyaceton. 2. Mitt. über Imidazolsynthesen mit flüssigem Ammoniak
1974
Imidazol-4-carbinole 3 mit funktionellen Gruppen am C-Atom 2 lassen sich aus Iminoestern 1 und Dihydroxyaceton (2) in flussigem Ammoniak unter Druck darstellen. Imidazole-4-carbinols from Iminoesters and Dihydroxyacetone Imidazole-4-carbinols 3 with functional groups at C-atom 2 are obtained from iminoesters 1 and dihydroxyacetone (2) in liquid ammonia under pressure.
NMR-Spektroskopie an Heterocyclen, 6. Mitt. Favorskii-Umlagerung von α-Brom-β-methoxy-ketonen bei der Imidazol-Cyclisierung in flüssigem Ammoniak
1979
Bei der Imidazolsynthese aus α-Bromketonen und Formiminoethylester in flussigem Ammoniak werden α-alkylsubstituierte Buttersaure-Amide als Nebenprodukte erhalten, deren Entstehen einer Favorskii-Umlagerung zugeschrieben wird. Die isolierten Verbindungen wurden NMR-spektroskopisch untersucht. NMR Spectroscopy of Heterocycles. VI: Favorskii Rearrangement of α-Bromo-β-methoxy Ketones During Imidazole Cyclisation in Liquid Ammonia. During imidazole synthesis with α-bromo ketones and formiminic ethyl ester in liquid ammonia α-alkylbutyric amides were obtained as by-products. Their formation is attributed to a Favorskii rearrangement. The compounds were investigated by NMR spectroscopy.
Imidazole aus Aldehyden, 1,2-Diketonen und flüssigem Ammoniak. 3. Mitt. über Imidazolsynthesen mit flüssigem Ammoniak
1974
Bei der Darstellung von Imidazolen (3) aus aliphatischen oder aromatischen Aldehyden (1) und 1,2-Diketonen (2) in flussigem Ammoniak unter Druck konnen die verschiedenen Moglichkeiten der C-Substitution des Imidazolkerns realisiert werden. Imidazoles from Aldehydes, 1,2-Diketones and Liquid Ammonia If imidazoles (3) are prepared from aliphatic or aromatic aldehydes (1) and 1,2-diketones (2) in liquid ammonia under pressure, all possibilities of C-substitution of the imidazole nucleus can be realized.
Crystal structure of cis-bis(μ-β-alanine-κ2 O:O′)bis[trichloridorhenium(III)](Re–Re) sesquihydrate
2015
A dirhenium(III) cis-dicarboxylate complex is reported, which is representative of a small class of zwitterionic ammoniacarboxylato complexes involving a quadruple metal–metal bond.
Methionine Cycle Rewiring by Targeting miR-873-5p Modulates Ammonia Metabolism to Protect the Liver from Acetaminophen
2022
Drug-induced liver injury (DILI) development is commonly associated with acetaminophen (APAP) overdose, where glutathione scavenging leads to mitochondrial dysfunction and hepatocyte death. DILI is a severe disorder without effective late-stage treatment, since N-acetyl cysteine must be administered 8 h after overdose to be efficient. Ammonia homeostasis is altered during liver diseases and, during DILI, it is accompanied by decreased glycine N-methyltransferase (GNMT) expression and S-adenosylmethionine (AdoMet) levels that suggest a reduced methionine cycle. Anti-miR-873-5p treatment prevents cell death in primary hepatocytes and the appearance of necrotic areas in liver from APAP-adminis…
L‐Aspartate as a high‐quality nitrogen source in Escherichia coli : Regulation of L‐aspartase by the nitrogen regulatory system and interaction of L‐…
2020
Escherichia coli uses the C4-dicarboxylate transporter DcuA for L-aspartate/fumarate antiport, which results in the exploitation of L-aspartate for fumarate respiration under anaerobic conditions and for nitrogen assimilation under aerobic and anaerobic conditions. L-Aspartate represents a high-quality nitrogen source for assimilation. Nitrogen assimilation from L-aspartate required DcuA, and aspartase AspA to release ammonia. Ammonia is able to provide by established pathways the complete set of intracellular precursors (ammonia, L-aspartate, L-glutamate, and L-glutamine) for synthesizing amino acids, nucleotides, and amino sugars. AspA was regulated by a central regulator of nitrogen meta…
Elementary steps in heterogeneous catalysis: The basis for environmental chemistry
2017
Kataliza stała się obecnie alternatywnym sposobem na natychmiastowe tworzenie produktu chemicznego z uwagi na niższą barierę energetyczną (między cząsteczkami a katalizatorami). Kataliza heterogenna obejmuje przyspieszenie reakcji chemicznej poprzez oddziaływanie cząsteczek związanych z powierzchnią ciała stałego. Jest to dyscyplina, która obejmuje różne aspekty chemii: chemię nieorganiczną i analityczną w celu scharakteryzowania katalizatorów i form tych katalizatorów. Chemia przemysłowa następnie łączy te wszystkie zagadnienia razem, aby zrozumieć chemiczną manipulację ciał stałych, reakcję chemiczną i inżynierię energetyczną oraz przenoszenie ciepła i masy w tych procesach katalitycznych…