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Organosilver Chemistry
Organosilver chemistry is the study of organometallic compounds containing a carbon to silver chemical bond. The theme is less developed than organocopper chemistry. The first attempts in organosilver were recorded by Buckton in 1859 and by J. A. Wanklyn & L. Carius in 1861. The synthesis of methyl silver was described by Semerano and Riccoboni Poor thermal stability is reflected in decomposition temperatures of AgMe (-50 °C) versus CuMe (-15 °C) and PhAg (74 °C) vs PhCu (100 °C).Greenwood and Earnshaw, pp. 1199–200 Alkyl, alkenyl, aryl derivatives Phenylsilver can be obtained by reaction of silver nitrate with a trialkylphenyllead or diphenylzinc: :Ph2Zn + AgNO3 → PhAg + "PhZnNO3" Like all silver complexes, organosilver compounds have coordination numbers ≥2. For example, mesitylsilver is a tetramer with 2-coordinate Ag(I) centers. It is produced by reaction of silver chloride and the Grignard reagent: :AgCl + (CH3)3C6H2MgBr → 1/4 CH3)3C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ag Mesityl Tetramer
A&G, AG, Ag or ag may refer to Businesses and organizations * A&G Railroad (former reporting mark AG) * Action Group (Nigeria), a political party during the Nigerian First Republic * Aktiengesellschaft, a German type of corporation * Assemblies of God, the world's largest Pentecostal organization * Associated Group, a Pakistani company * Astronomische Gesellschaft, a German astronomical society * IATA code for Aruba Airlines * Australian Greens, a political party Entertainment * ''American Gladiators'' (1989–1996 TV series) * ''American Gladiators'' (2008 TV series) * Atarashii Gakko!, a Japanese girl group Government and military * Adjutant general, the Army branch responsible for personnel * Administrator-General of South West Africa, the head of government in Namibia prior to independence in 1990 * Aerographer's mate, a rating or specialty in the US Navy that deals with weather and oceanography * American Holland-class submarine (''Amerikansky Golland''), a clas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transition Metal Carbene Complex
A transition metal carbene complex is an organometallic compound featuring a divalent carbon ligand, itself also called a carbene. Carbene complexes have been synthesized from most transition metals and f-block metals, using many different synthetic routes such as nucleophilic addition and alpha-hydrogen abstraction. The term carbene ligand is a formalism since many are not directly derived from carbenes and most are much less reactive than lone carbenes. Described often as , carbene ligands are intermediate between alkyls and carbynes . Many different carbene-based reagents such as Tebbe's reagent are used in synthesis. They also feature in catalytic reactions, especially alkene metathesis, and are of value in both industrial heterogeneous and in homogeneous catalysis for laboratory- and industrial-scale preparation of fine chemicals. Classification Metal carbene complexes are often classified into two types. The Fischer carbenes, named after Ernst Otto Fischer, feature s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cuneane
Cuneane () is a Saturated and unsaturated compounds, saturated hydrocarbon with the Chemical formula, formula and a Molecular geometry, 3D structure resembling a wedge, hence the name. Cuneane may be produced from cubane by metal-ion-catalyzed σ-bond rearrangement. Similar reactions are known for () and bishomocubane (). : Molecular geometry The carbon atoms in the cuneane molecule form a hexahedron with Molecular symmetry, point group C2v. The cuneane molecule has three kinds of equivalent carbon atoms (A, B, C), which have also been confirmed by NMR. The molecular graph of the carbon skeleton of cuneane is a regular graph with non-equivalent groups of vertices, and so it is a very important test object for different algorithms of mathematical chemistry. : Derivatives Some cuneane derivatives have liquid crystal properties. References {{Reflist Polycyclic nonaromatic hydrocarbons Cyclopropanes Cyclobutanes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cubane
Cubane is a synthetic hydrocarbon compound with the Chemical formula, formula . It consists of eight carbon atoms arranged at the corners of a Cube (geometry), cube, with one hydrogen atom attached to each carbon atom. A solid crystalline substance, cubane is one of the Platonic hydrocarbons and a member of the prismanes. It was first synthesized in 1964 by Philip Eaton and Thomas Cole. Before this work, Eaton believed that cubane would be impossible to synthesize due to the "required 90 degree molecular geometry, bond angles". The cubic shape requires the carbon atoms to adopt an unusually sharp 90° bonding angle, which would be highly strain (chemistry), strained as compared to the tetrahedral molecular geometry#Tetrahedral bond angle, 109.45° angle of a tetrahedral geometry, tetrahedral carbon. Once formed, cubane is quite kinetic stability, kinetically stable, due to a lack of readily available decomposition paths. It is the simplest hydrocarbon with octahedral symmetry. Havi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norbornadiene
Norbornadiene is an organic compound and a bicyclic hydrocarbon. Norbornadiene is of interest as a metal-binding ligand, whose complexes are useful for homogeneous catalysis. It has been intensively studied owing to its high reactivity and distinctive structural property of being a diene that cannot isomerize (isomers would be anti-Bredt alkenes). Norbornadiene is also a useful dienophile in Diels-Alder reactions. Synthesis Norbornadiene can be formed by a Diels-Alder reaction between cyclopentadiene and acetylene : Reactions Quadricyclane, a valence isomer, can be obtained from norbornadiene by a photochemical reaction when assisted by a sensitizer such as acetophenone: : The norbornadiene-quadricyclane couple is of potential interest for solar energy storage when controlled release of the strain energy stored in quadricyclane back to norbornadiene is made possible. Norbornadiene is reactive in cycloaddition reactions. Norbornadiene is also the starting materia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quadricyclane
Quadricyclane is a strained, multi-cyclic hydrocarbon with the formula CH2(CH)6. A volatile colorless liquid, it is highly strained molecule (78.7 kcal/mol). Isomerization of quadricyclane proceeds slowly at low temperatures.Petrov, V. A; Vasil’ev, N. V. “Synthetic Chemistry of Quadricyclane.” ''Current Organic Synthesis'' 3 (2006): 215–259 Because of quadricyclane's strained structure and thermal stability, it has been studied extensively. Preparation Quadricyclane is produced by the irradiation of norbornadiene (bicyclo .2.1epta-2,5-diene) in the presence of Michler's ketone or ethyl Michler's ketone. Other sensitizers, such as acetone, benzophenone, acetophenone, etc., may be used but with a lesser yield. The yield is higher for freshly distilled norbornadiene, but commercial reagents will suffice. : Proposed applications to solar energy The conversion of norbornadiene into quadricyclane is achieved with ~300 nm UV radiation. When converted back to norbornadiene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wolff Rearrangement
The Wolff rearrangement is a reaction in organic chemistry in which an α-diazocarbonyl compound is converted into a ketene by loss of dinitrogen with accompanying 1,2-rearrangement. The Wolff rearrangement yields a ketene as an intermediate product, which can undergo nucleophilic attack with weak acids, weakly acidic nucleophiles such as water, alcohols, and amines, to generate carbonyl#carboxylic acid derivatives, carboxylic acid derivatives or undergo 2+2 Photocycloaddition, [2+2] cycloaddition reactions to form four-membered rings. The mechanism of the Wolff rearrangement has been the subject of debate since its first use. No single mechanism sufficiently describes the reaction, and there are often competing concerted and carbene-mediated pathways; for simplicity, only the textbook, concerted mechanism is shown below. The reaction was discovered by Ludwig Wolff in 1902. The Wolff rearrangement has great synthetic utility due to the accessibility of α-diazocarbonyl compounds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver Oxide
Silver oxide is the chemical compound with the formula Ag2 O. It is a fine black or dark brown powder that is used to prepare other silver compounds. Preparation Silver oxide can be prepared by combining aqueous solutions of silver nitrate and an alkali hydroxide. This reaction does not afford appreciable amounts of silver hydroxide due to the favorable energetics for the following reaction: :( p''K'' = 2.875) With suitably controlled conditions, this reaction can be used to prepare Ag2O powder with properties suitable for several uses including as a fine grained conductive paste filler. Structure and properties Ag2O features linear, two-coordinate Ag centers linked by tetrahedral oxides. It is isostructural with Cu2O. It "dissolves" in solvents that degrade it. It is slightly soluble in water due to the formation of the ion and possibly related hydrolysis products. It is soluble in ammonia solution, producing active compound of Tollens' reagent. A slurry of Ag2O is readil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argentation Chromatography
Argentation chromatography is chromatography using a stationary phase that contains silver salts. Silver-containing stationary phases are well suited for separating organic compounds on the basis of the number and type of alkene groups. The technique is employed for gas chromatography and various types of liquid chromatography, including thin layer chromatography. Analytes containing alkene groups elute more slowly than the analogous compounds lacking alkenes. Separations are also sensitive to the type of alkene. The technique is especially useful in the analysis of fats and fatty acids, which are well known to exist in both saturated and unsaturated (alkene-containing) forms. For example, trans fats, undesirable contaminants in ultra-processed food An ultra-processed food (UPF) is a grouping of processed food characterized by relatively involved methods of production. There is no simple definition of UPF, but they are generally understood to be an industrial creation derived ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alkene Complex
In organic chemistry, an alkene, or olefin, is a hydrocarbon containing a carbon–carbon double bond. The double bond may be internal or at the terminal position. Terminal alkenes are also known as α-olefins. The International Union of Pure and Applied Chemistry (IUPAC) recommends using the name "alkene" only for acyclic hydrocarbons with just one double bond; alkadiene, alkatriene, etc., or polyene for acyclic hydrocarbons with two or more double bonds; cycloalkene, cycloalkadiene, etc. for cyclic ones; and "olefin" for the general class – cyclic or acyclic, with one or more double bonds. Acyclic alkenes, with only one double bond and no other functional groups (also known as mono-enes) form a homologous series of hydrocarbons with the general formula with ''n'' being a >1 natural number (which is two hydrogens less than the corresponding alkane). When ''n'' is four or more, isomers are possible, distinguished by the position and conformation of the double bond. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Structure Of AgNO3(trans-cyclooctene) GOJFEQ
A structure is an arrangement and organization of interrelated elements in a material object or system, or the object or system so organized. Material structures include man-made objects such as buildings and machines and natural objects such as biological organisms, minerals and chemicals. Abstract structures include data structures in computer science and musical form. Types of structure include a hierarchy (a cascade of one-to-many relationships), a network featuring many-to-many links, or a lattice featuring connections between components that are neighbors in space. Load-bearing Buildings, aircraft, skeletons, anthills, beaver dams, bridges and salt domes are all examples of load-bearing structures. The results of construction are divided into buildings and non-building structures, and make up the infrastructure of a human society. Built structures are broadly divided by their varying design approaches and standards, into categories including building structures, arch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
