Zhan Catalyst
A Zhan catalyst is a type of ruthenium-based organometallic complex used in olefin metathesis. This class of chemicals is named after the chemist who first synthesized them, Zheng-Yun J. Zhan. These catalysts are ruthenium complexes with functionally substituted alkoxybenzylidene carbene ligands, which can be chemically bonded to the surface of resins, PEG chains, and polymers. Like the structurally similar Hoveyda-Grubbs catalyst, they contain an isopropoxystyrene moiety, but include an extra electron-withdrawing sulfonamide group attached to the carbon ''para'' to the phenol oxygen. Of the three catalysts, Zhan Catalyst-1B and -1C both contain a dimethylsulfonamide moiety attached to the aryl ring, while Zhan Catalyst-II is connected to a resin via a sulfonamide linker. History The Zhan catalysts were inspired by previous work in the olefin metathesis field. Robert H. Grubbs first reported the first and second generation of Ru catalysts in 1992, with good metathesis activi ...
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Ruthenium
Ruthenium is a chemical element with the Symbol (chemistry), symbol Ru and atomic number 44. It is a rare transition metal belonging to the platinum group of the periodic table. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. Russian-born scientist of Baltic-German ancestry Karl Ernst Claus discovered the element in 1844 at Kazan State University and named ruthenium in honor of Russian Empire, Russia. Ruthenium is usually found as a minor component of platinum ores; the annual production has risen from about 19 tonnes in 2009Summary. Ruthenium
platinum.matthey.com, p. 9 (2009) to some 35.5 tonnes in 2017. Most ruthenium produced is used in wear-resistant electrical contacts and thick-film resistors. A minor application for ruthenium is in platinu ...
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ACS Catalysis
''ACS Catalysis'' is a monthly peer-reviewed scientific journal established in 2011 by the American Chemical Society. The journal covers research on all aspects of heterogeneous, homogeneous, and biocatalysis. The editor-in-chief is Cathleen Crudden, who assumed the position in early 2021. The journal received the Association of American Publishers’ PROSE Award for "Best New Journal in Science, Technology & Medicine" in 2013. Types of content The journal publishes the following types of articles: Letters, Articles, Reviews, Perspectives, and Viewpoints. Reviews, Perspectives, and Viewpoints appear mostly on invitation. Abstracting and indexing The journal is abstracted and indexed in: *Chemical Abstracts Service *Current Contents/Physical, Chemical & Earth Sciences *Ei Compendex *Science Citation Index Expanded *Scopus According to the ''Journal Citation Reports'', the journal has a 2021 impact factor of 13.700. References External links * {{DEFAULTSORT:Acs Catalysis Ca ...
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Sulfonamides
In organic chemistry, the sulfonamide functional group (also spelled sulphonamide) is an organosulfur group with the structure . It consists of a sulfonyl group () connected to an amine group (). Relatively speaking this group is unreactive. Because of the rigidity of the functional group, sulfonamides are typically crystalline; for this reason, the formation of a sulfonamide is a classic method to convert an amine into a crystalline derivative which can be identified by its melting point. Many important drugs contain the sulfonamide group. A sulfonamide (compound) is a chemical compound that contains this group. The general formula is or , where each R is some organic group; for example, "methanesulfonamide" (where R = methane, R' = R" = hydrogen) is . Any sulfonamide can be considered as derived from a sulfonic acid by replacing a hydroxyl group () with an amine group. In medicine, the term "sulfonamide" is sometimes used as a synonym for sulfa drug, a derivative or var ...
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Catalysts
Catalysis () is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst (). Catalysts are not consumed in the reaction and remain unchanged after it. If the reaction is rapid and the catalyst recycles quickly, very small amounts of catalyst often suffice; mixing, surface area, and temperature are important factors in reaction rate. Catalysts generally react with one or more reactants to form intermediates that subsequently give the final reaction product, in the process of regenerating the catalyst. Catalysis may be classified as either homogeneous, whose components are dispersed in the same phase (usually gaseous or liquid) as the reactant, or heterogeneous, whose components are not in the same phase. Enzymes and other biocatalysts are often considered as a third category. Catalysis is ubiquitous in chemical industry of all kinds. Estimates are that 90% of all commercially produced chemical products involve catalysts at some sta ...
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Organoruthenium Compounds
Organoruthenium chemistry is the chemistry of organometallic compounds containing a carbon to ruthenium chemical bond. Several organoruthenium catalysts are of commercial interest and organoruthenium compounds have been considered for cancer therapy. The chemistry has some stoichiometric similarities with organoiron chemistry, as iron is directly above ruthenium in group 8 of the periodic table. The most important reagents for the introduction of ruthenium are ruthenium(III) chloride and triruthenium dodecacarbonyl. In its organometallic compounds, ruthenium is known to adopt oxidation states from -2 ( u(CO)4sup>2−) to +6 ( uN(Me)4sup>−). Most common are those in the 2+ oxidation state, as illustrated below. File:Grubbs Catalyst 1st Generation.svg, 1st generation Grubbs catalyst File:ShvoCat.png, Shvo catalyst File:RuCymCl2.png, (cymene)ruthenium dichloride dimer File:Trirutheniumdodecacarbonyl.svg, triruthenium dodecacarbonyl. File:Chloro(cyclopentadienyl)bis(triphenylph ...
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Zhan Ligand Synthesis
Zhan may refer to: Places * Zhan, Kurdistan, an Iranian village in Kurdistan Province * Zhan Rural District in Lorestan Province, Iran ** Zhan, Lorestan, a village in Zhan Rural District Names * Zhan (surname), several Chinese-language surnames Given name * Zhuge Zhan (227–263), Chinese politician * Zhang Zhan (born 1983), Chinese lawyer and citizen journalist * Gao Zhan (21st century), Chinese smuggler * Zhan Videnov (born 1959), Prime Minister of Bulgaria * Zhan Bush (born 1993), Russian/Israeli figure skater See also * Zahn Zahn is a German and Ashkenazi Jewish surname. Notable persons with the surname include: *Albert Zahn, folk artist from Wisconsin, decorated the Albert Zahn House with carvings. * Anthony Zahn (born 1976), American cyclist * Ernst Zahn (1867–1952 ...

The Journal Of Organic Chemistry
''The Journal of Organic Chemistry'', colloquially known as ''JOC'', is a peer-reviewed scientific journal for original contributions of fundamental research in all branches of theory and practice in organic and bioorganic chemistry. It is published by the publishing arm of the American Chemical Society, with 24 issues per year. According to the ''Journal Citation Reports'', the journal had a 2017 impact factor of 4.805 and it is the journal that received the most cites (100,091 in 2017) in the field of organic chemistry. According to Web of Knowledge (and as December 2012), eleven papers from the journal have received more than 1,000 citations, with the most cited paper having received 7,967 citations. The current editor-in-chief is Scott J. Miller from Yale University. Indexing ''J. Org. Chem.'' is currently indexed in: See also *Organic Letters *Organometallics ''Organometallics'' is a biweekly journal published by the American Chemical Society. Its area of focus is ...
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Zhan Cat Synthesis
Zhan may refer to: Places * Zhan, Kurdistan, an Iranian village in Kurdistan Province * Zhan Rural District in Lorestan Province, Iran ** Zhan, Lorestan, a village in Zhan Rural District Names * Zhan (surname), several Chinese-language surnames Given name * Zhuge Zhan (227–263), Chinese politician * Zhang Zhan (born 1983), Chinese lawyer and citizen journalist * Gao Zhan (21st century), Chinese smuggler * Zhan Videnov (born 1959), Prime Minister of Bulgaria * Zhan Bush (born 1993), Russian/Israeli figure skater See also * Zahn Zahn is a German and Ashkenazi Jewish surname. Notable persons with the surname include: *Albert Zahn, folk artist from Wisconsin, decorated the Albert Zahn House with carvings. * Anthony Zahn (born 1976), American cyclist * Ernst Zahn (1867–1952 ...

Zhan Cat Ii
Zhan may refer to: Places * Zhan, Kurdistan, an Iranian village in Kurdistan Province * Zhan Rural District in Lorestan Province, Iran ** Zhan, Lorestan, a village in Zhan Rural District Names * Zhan (surname), several Chinese-language surnames Given name * Zhuge Zhan (227–263), Chinese politician * Zhang Zhan (born 1983), Chinese lawyer and citizen journalist * Gao Zhan (21st century), Chinese smuggler * Zhan Videnov (born 1959), Prime Minister of Bulgaria * Zhan Bush (born 1993), Russian/Israeli figure skater See also * Zahn Zahn is a German and Ashkenazi Jewish surname. Notable persons with the surname include: *Albert Zahn, folk artist from Wisconsin, decorated the Albert Zahn House with carvings. * Anthony Zahn (born 1976), American cyclist * Ernst Zahn (1867–1952 ...

Olefin Metathesis
Olefin metathesis is an organic reaction that entails the redistribution of fragments of alkenes (olefins) by the scission and regeneration of carbon-carbon double bonds. Because of the relative simplicity of olefin metathesis, it often creates fewer undesired by-products and hazardous wastes than alternative organic reactions. For their elucidation of the reaction mechanism and their discovery of a variety of highly active catalysts, Yves Chauvin, Robert H. Grubbs, and Richard R. Schrock were collectively awarded the 2005 Nobel Prize in Chemistry. Catalysts The reaction requires metal catalysts. Most commercially important processes employ heterogeneous catalysts. The heterogeneous catalysts are often prepared by in-situ activation of a metal halides (MClx) using organoaluminium or organotin compounds, e.g. combining MClx–EtAlCl2. A typical catalyst support is alumina. Commercial catalysts are often based on molybdenum and ruthenium. Well-defined organometallic co ...
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Angewandte Chemie International Edition
''Angewandte Chemie'' (, meaning "Applied Chemistry") is a weekly peer-reviewed scientific journal that is published by Wiley-VCH on behalf of the German Chemical Society (Gesellschaft Deutscher Chemiker). Publishing formats include feature-length reviews, short highlights, research communications, minireviews, essays, book reviews, meeting reviews, correspondences, corrections, and obituaries. This journal contains review articles covering all aspects of chemistry. According to the ''Journal Citation Reports'', the journal had a 2021 impact factor of 16.823. Editions The journal appears in two editions with separate volume and page numbering: a German edition, ''Angewandte Chemie'' ( (print), (online)), and a fully English-language edition, ''Angewandte Chemie International Edition'' ( (print), (online)). The editions are identical in content with the exception of occasional reviews of German-language books or German translations of IUPAC recommendations. Business model ''A ...
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Siegfried Blechert
Siegfried Blechert (born 1 March 1946 in Aalborg, Denmark) is a German chemist. Blechert studied chemistry at the University of Hannover, Germany and completed his PhD under the supervision of Ekkehard Winterfeldt in 1974. After a research stay with Pierre Potier in Gif-sur-Yvette, France, in 1981, he finished his habilitation at the University of Hannover in 1982 and there became lecturer in organic chemistry. In 1986 he took up a professorship at the University of Bonn. In 1990 he accepted the Chair of the Organic Chemistry Department at the Technical University of Berlin. His research interests include the development of new catalysts for olefin metathesis Olefin metathesis is an organic reaction that entails the redistribution of fragments of alkenes (olefins) by the scission and regeneration of carbon-carbon double bonds. Because of the relative simplicity of olefin metathesis, it often create ..., novel synthetic methods, and the stereoselective synthesis of natur ...
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