- Nitration of aromatics with dinitrogen pentoxide in a liquefied 1,1,1,2-tetrafluoroethane medium
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Regardless of the sustainable development path, today, there are highly demanded chemical productions still operating that bear environmental and technological risks inherited from the previous century. The fabrication of nitro compounds, and nitroarenes in particular, is traditionally associated with acidic wastes formed in nitration reactions exploiting mixed acids. However, nitroarenes are indispensable for industrial and military applications. We faced the challenge and developed a greener, safer, and yet effective method for the production of nitroaromatics. The proposed approach comprises the application of an eco-friendly nitrating agent, namely dinitrogen pentoxide (DNP), in the medium of liquefied 1,1,1,2-tetrafluoroethane (TFE) - one of the most non-hazardous Freons. Importantly, the used TFE is not emitted into the atmosphere but is effortlessly recondensed and returned into the process. DNP is obtainedviathe oxidation of dinitrogen tetroxide with ozone. The elaborated method is characterized by high yields of the targeted nitro arenes, mild reaction conditions, and minimal amount of easy-to-utilize wastes.
- Fauziev, Ruslan V.,Kharchenko, Alexandr K.,Kuchurov, Ilya V.,Zharkov, Mikhail N.,Zlotin, Sergei G.
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p. 25841 - 25847
(2021/08/09)
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- Convenient, metal-free ipso-nitration of arylboronic acids using nitric acid and trifluoroacetic acid
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A feasible protocol for the direct ipso-nitration of arylboronic acids using trifluoroacetic acid and nitric acid as nitration reagent has been developed. Various aromatic nitro compounds are produced in moderate to good yields under the metal-free conditions. The method is operationally simple and regioselective, and might have potential application in industry.
- Shen, Guodong,Zhao, Lingyu,Liu, Wanxing,Huang, Xianqiang,Song, Huina,Zhang, Tongxin
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supporting information
p. 10 - 14
(2016/12/30)
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- METATHESIS CATALYSTS AND METHODS THEREOF
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The present invention provides, among other things, novel compounds and methods for metathesis reactions. In some embodiments, a provided compound has the structure of formula I or II. In some embodiments, the present invention provides compounds and methods for Z-selective olefin metathesis.
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Paragraph 0338
(2014/10/29)
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- Monoaryloxide pyrrolide (MAP) imido alkylidene complexes of molybdenum and tungsten that contain 2,6-bis(2,5-R2-pyrrolyl) phenoxide (R = i-Pr, Ph) ligands and an unsubstituted metallacyclobutane on its way to losing ethylene
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We report the synthesis of Mo and W MAP complexes that contain O-2,6-(2,5-R2-pyrrolyl)2C6H3 (2,6-dipyrrolylphenoxide or ODPPR) ligands in which R = i-Pr, Ph. W(NAr)(CH-t-Bu)(Pyr)(ODPPPh) (4a; Ar = 2,6-disopropylphenyl, Pyr = pyrrolide) reacts readily with ethylene to yield a metallacyclobutane complex, W(NAr)(C3H6)(Pyr)(ODPPPh) (5). The structure of 5 in the solid state shows that it is approximately a square pyramid with the WC4 ring spanning apical and basal positions. This SP′ structure, which has never been observed as an actual intermediate, must now be regarded as an integral feature of the metathesis reaction.
- Reithofer, Michael R.,Dobereiner, Graham E.,Schrock, Richard R.,Mueller, Peter
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supporting information
p. 2489 - 2492
(2013/06/27)
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- PYRAZOLO[1,5a]PYRIMIDINE DERIVATIVES AS IRAK4 MODULATORS
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Compounds of the formula I or II: wherein X, m, Ar, R1 and R2 are as defined herein. The subject compounds are useful for treatment of IRAK-mediated conditions.
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Page/Page column 62
(2012/02/01)
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- Divalent metal ion sensors and binders
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Diamino polyacetate benzene compounds are used as a selective fluorescence probe, sensor, or binders for divalent metal ions. The compounds provide for uses as divalent metal ion sensors in diagnostic applications and binders for environmental and medical
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Page/Page column 4-5
(2008/06/13)
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- Derivatives of 4,6 dioxopyrido[3,2-g]quinoline 2,8 dicarboxylic acid
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Novel chemical compounds of the formula: SPC1 Wherein R is selected from the group consisting of hydrogen, alkyl from one to three carbon atoms, inclusive, phenyl, alkali metal, or an amine cation; X and Y can be the same or different and are selected from the group consisting of hydrogen, alkyl of from one to six carbon atoms, inclusive, cycloalkyl of 5 or 6 carbon atoms, inclusive, phenyl, hydroxyl, alkoxy having from one to three carbon atoms, inclusive, halogen, trifluoromethyl, cyano, carboxyamide and O C-OQ, EQU1 where Q is selected from the group consisting of hydrogen, alkyl from one to three carbon atoms, inclusive, alkali metal, and an amine cation, with the proviso that where R is hydrogen, alkali metal or an amine cation, then Q is the same as R, and where R is phenyl or alkyl from one to three carbon atoms, then Q is phenyl or alkyl from one to three carbon atoms; and Z is selected from the group consisting of hydrogen, alkyl from one to three carbon atoms, inclusive, and phenyl. The compounds are formulated with pharmaceutical carriers for oral or parenteral administration, with insufflation being the preferred method. The compositions are useful in the prophylactic treatment of sensitized humans and mammals for allergy and all anaphylactic reactions of a reagin or non-reagin mediated nature.
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