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Showing 1 to 12 of 52 entries
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Carbon dioxide reduction to methylamines under metal-free conditions.

Angewandte Chemie (International ed. in English)

Blondiaux E, Pouessel J, Cantat T.
PMID: 25243949
Angew Chem Int Ed Engl. 2014 Nov 03;53(45):12186-90. doi: 10.1002/anie.201407357. Epub 2014 Sep 22.

The first metal-free catalysts are reported for the methylation of amines with carbon dioxide. Proazaphosphatrane superbases prove to be highly active catalysts in the reductive functionalization of CO2, in the presence of hydroboranes. The new methodology enables the methylation...

Merger of visible light induced oxidation and enantioselective alkylation with a chiral iridium catalyst.

Chemistry (Weinheim an der Bergstrasse, Germany)

Wang C, Zheng Y, Huo H, Röse P, Zhang L, Harms K, Hilt G, Meggers E.
PMID: 25832794
Chemistry. 2015 May 11;21(20):7355-9. doi: 10.1002/chem.201500998. Epub 2015 Apr 01.

A single chiral octahedral iridium(III) complex is used for visible light activated asymmetric photoredox catalysis. In the presence of a conventional household lamp and under an atmosphere of air, the oxidative coupling of 2-acyl-1-phenylimidazoles with N,N-diaryl-N-(trimethylsilyl)methylamines provides aminoalkylated products...

Genetic resources for methane production from biomass described with the Gene Ontology.

Frontiers in microbiology

Purwantini E, Torto-Alalibo T, Lomax J, Setubal JC, Tyler BM, Mukhopadhyay B.
PMID: 25520705
Front Microbiol. 2014 Dec 03;5:634. doi: 10.3389/fmicb.2014.00634. eCollection 2014.

Methane (CH4) is a valuable fuel, constituting 70-95% of natural gas, and a potent greenhouse gas. Release of CH4 into the atmosphere contributes to climate change. Biological CH4 production or methanogenesis is mostly performed by methanogens, a group of...

N-methylation of amines with methanol at room temperature.

Organic letters

Tsarev VN, Morioka Y, Caner J, Wang Q, Ushimaru R, Kudo A, Naka H, Saito S.
PMID: 25915546
Org Lett. 2015 May 15;17(10):2530-3. doi: 10.1021/acs.orglett.5b01063. Epub 2015 Apr 27.

N-Methylation of amines with methanol proceeds at room temperature in the presence of a silver-loaded titanium dioxide (Ag/TiO2) photocatalyst under UV-vis light irradiation. This method allows facile synthesis/isolation of N-methylamines bearing various functional groups including N-benzyl, N-allyl, N-Boc, hydroxyl,...

Automation of flow injection gas diffusion-ion chromatography for the nanomolar determination of methylamines and ammonia in seawater and atmospheric samples.

The Journal of automatic chemistry

Gibb SW, Wood JW, Fauzi R, Mantoura C.
PMID: 18925047
J Automat Chem. 1995;17(6):205-12. doi: 10.1155/S1463924695000320.

The automation and improved design and performance of Flow Injection Gas Diffusion-Ion Chromatography (FIGD-IC), a novel technique for the simultaneous analysis of trace ammonia (NH(3)) and methylamines (MAs) in aqueous media, is presented. Automated Flow Injection Gas Diffusion (FIGD)...

Methanogenesis from methanol and methylamines and acetogenesis from hydrogen and carbon dioxide in the sediments of a eutrophic lake.

Applied and environmental microbiology

Lovley DR, Klug MJ.
PMID: 16346271
Appl Environ Microbiol. 1983 Apr;45(4):1310-5. doi: 10.1128/aem.45.4.1310-1315.1983.

C-tracer techniques were used to examine the metabolism of methanol and methylamines and acetogenesis from hydrogen and carbon dioxide in sediments from the profundal and littoral zones of eutrophic Wintergreen Lake, Michigan. Methanogens were primarily responsible for the metabolism...

Magnitude and mechanism of charge enhancement of CH··O hydrogen bonds.

The journal of physical chemistry. A

Adhikari U, Scheiner S.
PMID: 24028630
J Phys Chem A. 2013 Oct 10;117(40):10551-62. doi: 10.1021/jp4081788. Epub 2013 Sep 25.

Quantum calculations find that neutral methylamines and thioethers form complexes, with N-methylacetamide (NMA) as proton acceptor, with binding energies of 2-5 kcal/mol. This interaction is magnified by a factor of 4-9, bringing the binding energy up to as much...

Endergonic addition of N-methylamines to aromatic ketones driven by photochemical offset of the entropic cost.

Chemical communications (Cambridge, England)

Iwamoto T, Hosokawa A, Nakamura M.
PMID: 31513188
Chem Commun (Camb). 2019 Oct 07;55(78):11683-11686. doi: 10.1039/c9cc06011a. Epub 2019 Sep 12.

Intermolecular addition reactions are generally accompanied by an entropic penalty due to the decrease of molecular numbers during the reaction, which sometimes makes the reaction endergonic. Here we demonstrate that such an endergonic reaction can be promoted with light-energy...

Rumen methanogens and mitigation of methane emission by anti-methanogenic compounds and substances.

Journal of animal science and biotechnology

Patra A, Park T, Kim M, Yu Z.
PMID: 28149512
J Anim Sci Biotechnol. 2017 Jan 26;8:13. doi: 10.1186/s40104-017-0145-9. eCollection 2017.

Methanogenic archaea reside primarily in the rumen and the lower segments of the intestines of ruminants, where they utilize the reducing equivalents derived from rumen fermentation to reduce carbon dioxide, formic acid, or methylamines to methane (CH

A Structural and Functional Elucidation of the Rumen Microbiome Influenced by Various Diets and Microenvironments.

Frontiers in microbiology

Deusch S, Camarinha-Silva A, Conrad J, Beifuss U, Rodehutscord M, Seifert J.
PMID: 28883813
Front Microbiol. 2017 Aug 24;8:1605. doi: 10.3389/fmicb.2017.01605. eCollection 2017.

The structure and function of the microbiome inhabiting the rumen are, amongst other factors, mainly shaped by the animal's feed intake. Describing the influence of different diets on the inherent community arrangement and associated metabolic activities of the most...

Nitric Oxide-Dependent Mechanisms Underlying MK-801- or Scopolamine-Induced Memory Dysfunction in Animals: Mechanistic Studies.

International journal of molecular sciences

Cieślik P, Siekierzycka A, Radulska A, Płoska A, Burnat G, Brański P, Kalinowski L, Wierońska JM.
PMID: 34830164
Int J Mol Sci. 2021 Nov 13;22(22). doi: 10.3390/ijms222212282.

MK-801, an NMDA receptor antagonist, and scopolamine, a cholinergic receptor blocker, are widely used as tool compounds to induce learning and memory deficits in animal models to study schizophrenia or Alzheimer-type dementia (AD), respectively. Memory impairments are observed after...

ROLE OF UREA AND METHYLAMINES IN BUOYANCY OF ELASMOBRANCHS.

The Journal of experimental biology

Withers P, Hefter G, Pang TS.
PMID: 9317582
J Exp Biol. 1994 Mar;188(1):175-89.

The possible role of urea and trimethylamine oxide (TMAO) in providing positive buoyancy has been examined for elasmobranch fishes. TMAO has a considerably lower density than an equimolar solution of urea, and solutions of both TMAO and urea are...

Showing 1 to 12 of 52 entries