Pincer Carbene Enables Nitrile Coupling
Pincer carbene ligands mediate the coupling of a coordinated acetonitrile ligand and its unusual reactivity opens application in catalysis
Pincer carbene ligands mediate the coupling of a coordinated acetonitrile ligand and its unusual reactivity opens application in catalysis
Investigation of the radical migration from the sulfur atom in the radical cation of glutathione, an important antioxidant
A Short, Gram-Scale Synthesis of 2,5-Disubstituted Furans (pages 3219–3222)
Stanley Chang, Saheena Desai, Daniel B. Leznoff, Nabyl Merbouh and Robert Britton
| DOI: 10.1002/ejoc.201300305
European Journal of Organic Chemistry
A modified Feist–Bénary furan synthesis has been developed that involves a lithium aldol reaction of an -chloroaldehyde followed by a thermally induced tetrahydrofuran formation/dehydration sequence. This process provides access to a range of 2,5-disubstituted furans and is demonstrated on multigram scale. |
A modified Feist–Bénary furan synthesis has been developed that involves a lithium aldol reaction between a methyl ketone and an α-chloroaldehyde followed by a thermally induced tetrahydrofuran formation/dehydration sequence and affords 2,5-disubstituted furans in good overall yield. This process is demonstrated on multigram scale and is amenable to the production of symmetric or asymmetric furans that incorporate a range of substituents (e.g., aryl, tert-butyl, ferrocenyl).
http://onlinelibrary.wiley.com/doi/10.1002/ejoc.201300305/abstract
1,3-Dienes and 1,3,5-trienes can be formed simply by a microwave-accelerated Ru-catalyzed hydrovinylation of alkynes and enynes
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Separation of dicarboxylic acids through solid-state molecular recognition and mechanochemistry
PHAMA39EB3YP
discuss the most common and reliable methods for the reduction of aldehydes, ketones, carboxylic acids, esters, amides, imides, and acid chlorides. Representative examples illustrate detailed reaction and workup conditions and highlight the advantages and limitations of each reducing agent with special emphasis on safety, cost, and amenability to scale-up.
IR spectroscopy has been widely employed to distinguish between different crystal forms such as polymorphs, clathrates, hydrates and co-crystals. IR has been used to monitor co-crystal formation and single synthon detection. In this work, we have developed a strategy to identify multiple supramolecular synthons in polymorphs and co-crystals with this technique.
The identification of multiple synthons in co-crystals with IR is difficult for several reasons. In this paper, a four step method involving well assigned IR spectral markers that correspond to bonds in a synthon is used. IR spectra of three forms of the co-crystal system, 4-hydroxybenzoic acid:4,4′-bipyridine (2:1), show clear differences that may be attributed to differences in the synthon combinations existing in the forms (synthon polymorphism).
These differences were picked out from the three IR spectra and the bands analysed and assigned to synthons. Our method first identifies IR marker bands corresponding to (covalent) bonds in known/model crystals and then the markers are mapped in known co-crystals having single synthons. Thereafter, the IR markers are queried in known co-crystals with multiple synthons.
Finally they are queried in unknown co-crystals with multiple synthons. In the last part of the study, the N–H stretching absorptions of primary amides that crystallize with the amide dimers linked in a ladder like chain show two specific absorptions which are used as marker absorptions and all variations of this band structure have been used to provide details on the environment around the dimer. The extended dimer can accordingly be easily distinguished from the isolated dimer.
Arijit mukherjee et al
DOI: 10.1039/C3CE40286J
Received 14 Feb 2013, Accepted 28 Mar 2013
First published online 02 Apr 2013
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