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Angewandte Chemie is a weekly peer-reviewed scientific journal that is published by Wiley-VCH on behalf of the German Chemical Society. 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.
Atropisomers are stereoisomers arising because of hindered rotation about a single bond, where energy differences due to steric strain or other contributors create a barrier to rotation that is high enough to allow for isolation of individual conformers. They occur naturally and are important in pharmaceutical design. When the substituents are achiral, these conformers are enantiomers (atropoenantiomers), showing axial chirality; otherwise they are diastereomers (atropodiastereomers).
In chemistry, transfer hydrogenation is a chemical reaction involving the addition of hydrogen to a compound from a source other than molecular H2. It is applied in laboratory and industrial organic synthesis to saturate organic compounds and reduce ketones to alcohols, and imines to amines. It avoids the need for high-pressure molecular H2 used in conventional hydrogenation. Transfer hydrogenation usually occurs at mild temperature and pressure conditions using organic or organometallic catalysts, many of which are chiral, allowing efficient asymmetric synthesis. It uses hydrogen donor compounds such as formic acid, isopropanol or dihydroanthracene, dehydrogenating them to CO2, acetone, or anthracene respectively. Often, the donor molecules also function as solvents for the reaction. A large scale application of transfer hydrogenation is coal liquefaction using "donor solvents" such as tetralin.
In organosilicon chemistry, silyl enol ethers are a class of organic compounds that share the common functional group R3Si−O−CR=CR2, composed of an enolate bonded to a silane through its oxygen end and an ethene group as its carbon end. They are important intermediates in organic synthesis.
The Negishi coupling is a widely employed transition metal catalyzed cross-coupling reaction. The reaction couples organic halides or triflates with organozinc compounds, forming carbon-carbon bonds (C-C) in the process. A palladium (0) species is generally utilized as the metal catalyst, though nickel is sometimes used. A variety of nickel catalysts in either Ni0 or NiII oxidation state can be employed in Negishi cross couplings such as Ni(PPh3)4, Ni(acac)2, Ni(COD)2 etc.
Eric N. Jacobsen is the Sheldon Emery Professor of Chemistry and former chair of the department of chemistry and chemical biology at Harvard University. He is a prominent figure in the field of organic chemistry and is best known for the development of the Jacobsen epoxidation and other work in selective catalysis.
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Organoiron chemistry is the chemistry of iron compounds containing a carbon-to-iron chemical bond. Organoiron compounds are relevant in organic synthesis as reagents such as iron pentacarbonyl, diiron nonacarbonyl and disodium tetracarbonylferrate. While iron adopts oxidation states from Fe(−II) through to Fe(VII), Fe(IV) is the highest established oxidation state for organoiron species. Although iron is generally less active in many catalytic applications, it is less expensive and "greener" than other metals. Organoiron compounds feature a wide range of ligands that support the Fe-C bond; as with other organometals, these supporting ligands prominently include phosphines, carbon monoxide, and cyclopentadienyl, but hard ligands such as amines are employed as well.
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6nH
4n Such a molecule is usually denoted [n]CPP where n is the number of benzene rings.
Corinna S. Schindler is a Professor of Chemistry at the University of Michigan. She develops catalytic reactions with environmentally benign metals such as iron, towards the synthesis of biologically active small molecules. For her research in the development of new catalysts, Schindler has been honored with several early-career researcher awards including the David and Lucile Packard Foundation Fellowship in 2016, the Alfred P. Sloan Fellowship in 2017, and being named a member of the C&EN Talented 12 in 2017. Schindler has served on the Editorial Board of Organic and Bimolecular Chemistry since 2018.
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Copper-catalyzed allylic substitutions are chemical reactions with unique regioselectivity compared to other transition-metal-catalyzed allylic substitutions such as the Tsuji-Trost reaction. They involve copper catalysts and "hard" carbon nucleophiles. The mechanism of copper-catalyzed allylic substitutions involves the coordination of copper to the olefin, oxidative addition and reductive elimination. Enantioselective versions of these reactions have been used in the synthesis of complex molecules, such as (R)-(-)-sporochnol and (S)-(-)-Zearalenone.
References
- ↑ Clayden, Jonathan (1993). The asymmetric epoxidation of allylic phosphine oxides: a stereocontrolled synthesis of allylic systems (PhD thesis). University of Cambridge.
- ↑ Clayden, Jonathan; Moran, Wesley J.; Edwards, Paul J.; LaPlante, Steven R. (17 August 2009). "The Challenge of Atropisomerism in Drug Discovery". Angewandte Chemie International Edition. 48 (35): 6398–6401. doi:10.1002/anie.200901719. ISSN 1521-3773. PMID 19637174.
- ↑ Byrne, Liam; Solà, Jordi; Boddaert, Thomas; Marcelli, Tommaso; Adams, Ralph W.; Morris, Gareth A.; Clayden, Jonathan (3 January 2014). "Foldamer-Mediated Remote Stereocontrol: >1,60 Asymmetric Induction" (PDF). Angewandte Chemie International Edition. 53 (1): 151–155. doi:10.1002/anie.201308264. ISSN 1521-3773. PMID 24375739.
- ↑ Le Bailly, Bryden A. F.; Clayden, Jonathan (24 March 2016). "Dynamic foldamer chemistry". Chem. Commun. 52 (27): 4852–4863. doi: 10.1039/c6cc00788k . hdl: 1983/8e0ce263-cb79-455f-b99e-40f2db2b8ba5 . PMID 26955864.
- ↑ Clayden, Jonathan; Greeves, Nick; Warren, Stuart (2012). Organic Chemistry (Second ed.). Oxford: OUP. ISBN 978-0-19-927029-3.
- ↑ Clayden, Jonathan (2002). Organolithiums: Selectivity for Synthesis. Oxford: Pergamon. ISBN 978-0-08-043261-8.
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