Enolization Reactions Mediated by S-Block Metal Amide - Adlibris
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A mild, metal-free, multicomponent reaction provides N-acyl amidines from nitroalkene derivatives, dibromo amides, and amines via formation of an initial α,α-dibromonitroalkane intermediate that can undergo C-C bond cleavage. Thermodynamic properties of alkali and alkaline earth metal amides are critical for their performance in hydrogen storage as well as catalytic ammonia synthesis. In this work, the ammonia equilibrium concentrations of LiNH 2 , KNH 2 and Ba(NH 2 ) 2 at ca.10 bar of hydrogen pressure and different temperatures were measured by using a high-pressure gas-solid reaction system equipped with a … metal amides. Metal amides react with metal hydrides to desorb hydrogen and these reactions have been paid attention as new hydrogen storage systems since Chen et al.’s report [1]. Hydrogen desorbed from these compounds contaminated by a small amount of NH3 originated from decomposition of the amides themselves, which would be a 2014-04-28 1976-03-01 2016-09-27 osti.gov journal article: reaction of uranium tetrachloride with alkali amides. Metal-Free Transamidation of Secondary Amides by N–C Cleavage Transamidation reactions represent a fundamental chemical process involving conversion of one amide functional group into another.
The elimination reaction follows to kick off the amine, which then acts to deprotonate the hydroxyl hydrogen of the carboxylic acid. In the final step, an acid is added av H Lundberg · 2015 — The catalytic protocols presented herein use titanium, zirconium and hafnium complexes under mild reaction conditions to produce amides in av F Tinnis · Citerat av 88 — The method allows the synthesis of tertiary amides with highly congested aryl moieties, and avoids the regioselectivity problems observed in reactions with ( Enolization Reactions Mediated by S-Block Metal Amide Reagents: He, Xuyang: Amazon.se: Books. Pris: 999 kr. Häftad, 2009.
William Siljebo - Umeå universitet
Although there are many types of carboxylic acid derivatives known we will be focusing on just four: Acid halides, Acid anhydrides, Esters, and Amides. In this article are summarized general properties, synthesis, reactivity, and catalysis of Group 4 transition metal amide complexes.
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Acidic conditions yield the carboxylic acid and the ammonium ion while basic hydrolysis yield the carboxylate ion and ammonia.
The main difference is the presence of an electronegative substituent that can act as a leaving group during nucleophile substitution reactions. Although there are many types of carboxylic acid derivatives known we will be focusing on just four: Acid halides, Acid anhydrides, Esters, and Amides.
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Fire Hazard. Excerpt from ERG Guide The reactions of the transition-metal amides M[N(SiMe,)2]2 (M = Mn, Fe) with transition-metal complexes that involve both phosphide and amide ligands, for It is of course not only the deprotonation reaction which can be executed with alkali- metal utility amides (see Section 2).
2.1 Palladium Catalysis.
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Epoxides are also reduced to give ring-opened products. THF or diethylehter is used as the inert solvent that dissolves LAH. Water and protic solvents react violently with LAH to generate hydrogen gas.
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Berit Olofsson - Google Scholar
Prof. Dr. Michal Szostak. Reactions of Amides Hydrolysis of Amides. The mechanism for both hydrolysis reactions involves the two steps of addition elimination Esters from Amides. We have seen that esters can be converted to amides since the OR – group of the ester is a better Reduction of Amides.
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Other Both the gas chromatographic examination and X-ray diffraction measurement indicated that the reaction between alkali or alkaline earth metal hydride MH x (such as LiH, NaH, MgH 2 and CaH 2 ) and gaseous NH 3 could quickly proceed at room temperature by ball milling and the corresponding metal amides were easily synthesized in high quality. The reactivity of several functionalized indoles 2-(RNHCH 2)C 8 H 5 NH (R = C 6 H 5 (1), t Bu (2), 2,6-i Pr 2 C 6 H 3 (3)) with rare-earth metal amides is described. Reactions of 1 or 2 with [(Me 3 Si) 2 N] 3 RE(μ-Cl)Li(THF) 3 (RE = Eu, Yb) respectively produced the europium complexes [2-(C 6 H 5 N CH)C 8 H 5 N] 2 Eu[N(SiMe 3) 2] (4) and [2-(t BuN CH)C 8 H 5 N]Eu[N(SiMe 3) 2] 2 (5), and the ytterbium complex [2-(t … The reactivities of different 3-imino-functionalized indoles with rare-earth-metal amides [ (Me 3 Si) 2 N] 3 RE (μ-Cl)Li (THF) 3 were studied to reveal unexpected substituent effects on C–H bond activation pathways, leading to the formation of unusual rare-earth-metal complexes. The combined catalysts exhibited much better activity than their components KH or alkaline-earth metal amides, suggesting an obvious bimetallic synergistic effect. Preliminary mechanism studies revealed a degradation and activation effect of the alkaline-earth metal amides on saline KH. ALKALI METAL AMIDES are basic.
The article includes Suzuki–Miyaura, Kumada–Corriu, Negishi, and Hiyama cross-coupling reactions. 1 Introduction. 2 Suzuki–Miyaura Cross-Coupling. 2.1 Palladium Catalysis. 2.2 Nickel Catalysis. 3 Kumada–Corriu Cross-Coupling. 3.1 Nickel Request PDF | Metal-Free Transamidation of Secondary Amides by N–C Cleavage | Transamidation reactions represent a fundamental chemical process involving … Amide synthesis.