- 1,2-Dibenzoyl- and 1-benzoyl-2-acetylhydrazines as reagents for recovering Cu(II) ions from alkaline solutions
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The conditions of complexation of 1,2-diacylhydrazines (H2L) C6H5C(O)NHNHC(O)R, where R = C6H5 or CH3, with Cu(II) ions in alkaline solutions were studied. The composition of the complexes formed by precipitation of Cu(II) from alkaline solutions, (CuOH)2L and CuL, was determined. The possibility of afterpurification of solutions with a low Cu(II) content by pneumatic flotation using H2L was examined.
- Radushev,Chekanova,El'chishcheva,Ershova
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Read Online
- Photochemical reactions of metamitron
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Photochemical reactions of metamitron (a 4-amino substituted as-triazin-5(4H)-one) were investigated including UV- and phosphorescence spectroscopy, determination of quantum yields, comparison with measurements in sunlight and products found. The photolys
- Palm,Millet,Zetzsch
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Read Online
- METAL COMPLEX, COMPOSITION AND LIGHT EMITTING DEVICE
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A metal complex represented by formula (1) is provided. In formula (1), X represents a nitrogen atom or a group represented by ═C(RX)—; R1 represents an alkyl group having 4 or more carbon atoms; R2 represents an alkyl, cycloalkyl, alkoxy, cycloalkoxy, aryl, aryloxy, monovalent heterocyclic, or substituted amino group or a halogen atom; rings A and B each independently represent an aromatic hydrocarbon ring or an aromatic heterocyclic ring; M represents a rhodium, palladium, iridium, or platinum atom; n1 represents an integer of 1 or more, n2 represents an integer of 0 or more, and n1+n2 is 2 or 3; A1-G1-A2 represents an anionic bidentate ligand; A1 and A2 each independently represent a carbon atom, an oxygen atom, or a nitrogen atom; and G1 represents a single bond or an atomic group constituting a bidentate ligand together with A1 and A2.
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Paragraph 0601-0605
(2019/07/03)
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- Pd-catalyzed oxidative annulation of hydrazides with isocyanides: Synthesis of 2-amino-1,3,4-oxadiazoles
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An efficient palladium-catalyzed oxidative annulation reaction was developed through sequential isocyanide insertions into N-H and O-H bonds of hydrazides, which provides an efficient access to valuable 2-amino-1,3,4- oxadiazoles and their derivatives.
- Fang, Tao,Tan, Qitao,Ding, Zhengwei,Liu, Bingxin,Xu, Bin
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supporting information
p. 2342 - 2345
(2014/05/20)
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- Synthesis of 1,3,4-oxadiazoles from 1,2-diacylhydrazines using [Et 2NSF2]BF4 as a practical cyclodehydration agent
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The preparation of 1,3,4-oxadiazoles from 1,2-diacylhydrazines using XtalFluor-E ([Et2NSF2]BF4) as cyclodehydration reagent is described. Various functionalized 1,3,4-oxadiazoles were synthesized and it was found that the use of acetic acid as an additive generally improved the yields.
- Pouliot, Marie-France,Angers, Laetitia,Hamel, Jean-Denys,Paquin, Jean-Francois
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supporting information; experimental part
p. 988 - 993
(2012/04/10)
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- Reactivity of benzohydrazide derivatives towards acetylation reaction. Experimental and theoretical studies
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We herein report an experimental and theoretical study on the acetylation reaction of benzohydrazide derivatives towards p-nitrophenyl acetate (NPA). The kinetic data are consistent with a stepwise mechanism with the nucleophilic attack as the rate determining step. From the theoretical analysis it is found that benzohydrazide derivatives establish intramolecular proton rearrangement. The enol form appears as the active species for nucleophilic attack. A reaction mechanism incorporating keto-enol pre-equilibria is proposed. The study is completed with a local reactivity analysis describing the most reactive centers for nucleophilic attack together with a site activation analysis describing inductive substituent effects.
- Campodónico, Paola R.,Aliaga, Margarita E.,Santos, José G.,Castro, Enrique A.,Contreras, Renato
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scheme or table
p. 86 - 89
(2010/06/11)
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- MAOS protocols for the general synthesis and lead optimization of 3,6-disubstituted-[1,2,4]triazolo[4,3-b]pyridazines
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General, high-yielding MAOS protocols for the expedient synthesis of functionalized 3,6-disubstituted-[1,2,4]triazolo[4,3-b]pyridazines are described amenable to an iterative analog library synthesis strategy for the lead optimization of an M1 antagonist
- Aldrich, Leslie N.,Lebois, Evan P.,Michelle Lewis,Nalywajko, Natalia T.,Niswender, Colleen M.,David Weaver,Jeffrey Conn,Lindsley, Craig W.
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scheme or table
p. 212 - 215
(2009/05/07)
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- Near-infrared-absorbing organic electrochromic materials
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The invention provides generally a new type of organic electrochromic Near Infrared (NIR)-active materials capable of absorbing and attenuating the light in the NIR region around 1550 nm and forming thin films on electrodes for variable optical attenuator
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Page/Page column 7
(2008/12/07)
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- 4-Oxa and 4-thia steroids
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The compounds of the present invention are those of structural formula (I) STR1 wherein X is oxygen or sulfur. Pharmaceutical compositions and methods of use of the compounds in the treatment of hyperandrogenic conditions are disclosed. In addition, the combination of the compounds with other active agents such as finasteride, minoxidil and retinoic acid or a derivative thereof is disclosed.
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- Synthesis of Unsymmetrically Substituted 4H-1,2,4-Triazoles
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A general method was developed for the synthesis of unsymmetrically 3,5-disubstituted 4H-1,2,4-triazoles (Ph, H or Ph, CH3) with allyl or benzyl groups in the 4-ring position.The reaction of the corresponding 3,5-disubstituted 1,3,4-oxadiazoles with allyl
- Carlsen, Per H. J.,Joergensen, Kare B.
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p. 805 - 808
(2007/10/02)
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- A new method for synthesis of 1H-pyrazol-3(2H)-ones
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A new preparative method is reported for the synthesis of 4,5-disubstituted 1,2-dimethyl-1H-pyrazol-3(2H)-ones 5a-e,g-k from N,N-diacyl-N,N'-dimethylhydrazines 1a-e,g,h,j,k. The method is based on the intramolecular formation of thc 4,5-bond in the pyrazo
- Magedov,Smushkevich
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p. 845 - 848
(2007/10/02)
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- Synthesis and analgesic activity in 1,2,4-triazole series
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Derivatives of 1,2,4-triazole have been synthesized. Several methods of synthesis were used and the analgetic and antiinflammatory properties of the products obtained were studied. Structural requirements for analgetic activity were specified. Certain compounds show a high degree of analgetic activity. One of them, RU 39813, has been chosen for extended pharmacological study.
- Clemence,Joliveau-Maushart,Meier,et al.
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p. 257 - 266
(2007/10/02)
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