Results 251 to 260 of about 2,342 (296)

Direct Nitration of Vinylcycles with Copper Nitrate

Organic Letters, 2023
A direct nitration of vinylcyclopropanes is disclosed with Cu(NO3)2 and KI in a regio- and stereoselective manner to afford nitroalkenes efficiently, where the cyclopropane skeleton was retained. The given method could be extended to other vinylcycles as well as biomolecule derivatives with wide substrate scope, good functionality tolerance, and ...
Litao Zhou, Ruoxin Huang, Shaohang Lu, Bingxin Liu, Mingchun Gao, Bin Xu   +5 more
openaire   +2 more sources

Direct aromatic nitration by bacterial P450 enzymes

2023
Nitro aromatics have broad applications in industry, agriculture, and pharmaceutics. However, their industrial production is faced with many challenges including poor selectivity, heavy pollution and safety concerns. Nature provides multiple strategies for aromatic nitration, which opens the door for the development of green and efficient biocatalysts.
Manyun, Chen, Vanisa, Petriti, Amit, Mondal, Yujia, Jiang, Yousong, Ding   +4 more
openaire   +2 more sources

The Direct Nitration of Flax and Jute

Textile Research Journal, 1960
Three samples of flax and one sample of jute were nitrated with a mixture of HNO 3 /H 3 PO 4 /P 2 O 5 for several lengths of time ...
Menachem Lewin, Joseph A. Epstein
openaire   +1 more source

Novel nitrates as NO mimetics directed at Alzheimer's disease

Journal of Alzheimer's Disease, 2005
GT 1061 is a novel therapeutic agent that is in Phase 1 clinical studies for Alzheimer's disease. GT 1061 is one of a family of novel nitrates that have demonstrated neuroprotective properties and cognition- and memory-enhancing properties in animal models.
Gregory R J, Thatcher, Brian M, Bennett, Hans C, Dringenberg, James N, Reynolds   +3 more
openaire   +2 more sources

Organic Nitrates: Direct Antiplatelet Effects and Synergism with Prostacyclin

Thrombosis and Haemostasis, 1988
SummaryIsosorbide dinitrate inhibits platelet function in vivo at concentrations about 10 times lower than in vitro (10-7 -10-6 vs. 10-6 -10-5 M). We investigated two possible reasons for this difference. Isosorbide dinitrate and its in vivo longer-lived metabolites, isosorbide-2- and isosorbide-5-mononitrate were incubated for 5 min with human ...
DE CATERINA, Raffaele, Giannessi D, Bernini W, Mazzone A.   +3 more
openaire   +4 more sources

A model of direct potentiometric determination of nitrate

Fresenius' Zeitschrift für analytische Chemie, 1977
The paper represents a model for evaluation of the combined influence of four interferences in the direct potentiometric determination of nitrate in soil samples. The correction of the complex analytical signal is performed by the use of the system-oriented technique PAMS and modern statistical methods for modelling and optimization of multi-factorial ...
V. Simeonov, H. Malissa
openaire   +1 more source

Direct Nitration Reactions of Photochromic Spirooxazines

Molecular Crystals and Liquid Crystals, 2005
ABSTRACT A direct nitration of photochromic spirooxazines was carried out by three different methods. The molecular structure of main products was determined by NMR 1H and 13C spectra. The nitration mechanisms were proposed. It was shown that only nitration by mixture of nitric and sulfuric acids gives photochromic compounds with nitrogroup in ...
N. L. Zaichenko, A. I. Shiyonok, L. S. Kol'tsova, V. S. Marevtsev   +3 more
openaire   +1 more source

Preparation ofN-nitrohydroxylamines by direct nitration

Russian Chemical Bulletin, 1995
The possibilities for stabilization of compounds with the A-B-NO2 fragment, where A is an atom containing a lone electron pair, were examined. It was shown thatN-methyl-O-2,4-dinitro- and 2,4,6-trinitrophenylhydroxylamines undergo nitration with nitronium tetrafluoroborate or with a mixture of nitric acid and acetic anhydride to give the correspondingN-
E. N. Khodot, I. M. Petrova, O. V. Anikin, I. E. Chlenov   +3 more
openaire   +1 more source

ChemInform Abstract: DIRECT NITRATION OF BENZIMIDAZOLONE AND REDUCTION OF SOME OF THE NITRATION PRODUCTS

Chemischer Informationsdienst, 1977
AbstractDie Nitrierung der Titelverbindung (II) zum Mono‐ (Ia), Di‐[(Ib) bzw. ‐ (III)‐analoges Tautomeres], Tri‐ (IIIa) bzw. Tetranitroderivat (IIIb) gelingt mit konz. bzw. rauchender HNO3 unter den angegebenen Bedingungen.
H. SCHINDLBAUER, W. KWIECINSKI
openaire   +1 more source

DNDMH-mediated direct nitration of aryl alkenes

Chemical Communications
Direct nitration of aryl alkenes is enabled by DNDMH, a mild nitration tool developed previously in our laboratory. It exhibits a new property of DNDMH through probably the delivery of nitro radical with the aid of TEMPO and Cu(OAc)2.
Lihua Niu, Hao Guo, Fuqiang Jia, Jiayu Shen, Yunxia Wang, Xiangdong Hu   +5 more
openaire   +2 more sources