- Magnetic Co3O4/reduced graphene oxide nanocomposite as a superior heterogeneous catalyst for one-pot oxidative esterification of aldehydes to methyl esters
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A magnetically separable hybrid material consisting of Co3O4 nanoparticles supported on reduced graphene oxide (Co3O4/rGO) was synthesized through a simple co-reduction process of graphene oxide (GO) and cobalt chloride (CoCl2) using sodium borohydride (NaBH4). The Co3O4/rGO heterogeneous catalyst exhibited a high-performance for the oxidative esterification of aldehydes to the corresponding methyl esters using tert-butyl hydroperoxide (TBHP) as an oxidant. Owing to the synergistic effect of rGO support, the hybrid catalyst exhibited superior catalytic activity to the corresponding cobalt oxide catalyst. Importantly, the synthesized hybrid possesses good magnetic properties, which enable facile recovery of the catalyst by using an external magnet.
- Panwar, Vineeta,Al-Nafiey, Amer,Addad, Ahmed,Sieber, Brigitte,Roussel, Pascal,Boukherroub, Rabah,Jain, Suman L.
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p. 88567 - 88573
(2015/11/09)
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- Iridium-catalyzed oxidative methyl esterification of primary alcohols and diols with methanol
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Oxidative methyl esterification of primary alcohols and diols with methanol was successfully achieved, using acetone as a hydrogen acceptor, under the influence of an iridium complex combined with 2-(methylamino)ethanol (MAE) as catalyst.
- Yamamoto, Nobuyuki,Obora, Yasushi,Ishii, Yasutaka
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experimental part
p. 2937 - 2941
(2011/05/30)
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- Highly selective formation of linear esters from terminal and internal alkenes catalysed by palladium complexes of bis-(di-tert-butylphosphinomethyl) benzene
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The methoxycarbonylation of terminal or internal alkenes catalysed by palladium complexes of bis-(di-tert-butylphosphinomethyl)benzene under mild conditions leads to linear esters in 99% selectivity via a hydride mechanism.
- Rodriguez, Cristina Jimenez,Foster, Douglas F.,Eastham, Graham R.,Cole-Hamilton, David J.
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p. 1720 - 1721
(2007/10/03)
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- GAMMA LACTAMS AS PROSTAGLANDIN AGONISTS AND USE THEREOF
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1,2-substituted 5-pyrrolidinone compounds are provided, and methods of treatment and pharmaceutical composition that utilize or comprise one or more such compounds. Compounds of the invention are useful for a variety of therapies, including treating or preventing preterm labor, dysmenorrhea, asthma, hypertension, infertility or fertility disorder, undesired blood clotting, preeclampsia or eclampsia, an eosinophil disorder, sexual dysfunction, osteporosis and other destructive bone disease or disorder, renal dysfunction, an immune deficiency disorder, dry eye, ichthyosis, elevated intraocular pressure, sleep disorder, or gastric ulcer, inflammatory disorders and other diseases and disorders associated with the prostaglandin family of compounds.
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- Prostaglandins E and anti-ulcers containing same
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The novel 13,14-dihydro-15-keto prostaglandins E of the invention have remarkable preventive effects against ulcers. Further, the novel 13,14-dihydro-15-keto-prostaglandins E of the invention have an advantage that they have none of side effects which prostaglandin E intrinsically has, or can remarakably reduce such effects of the prostaglandin E. Therefore, the novel 13,14-dihydro-15-keto prostaglandins E of the invention are effective for animal and human use for treatment and prevention of ulcers, such as duodenal ulcer and gastric ulcer.
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- A nickelacycle as propionic acid equivalent for carbon-carbon coupling reactions; application to the synthesis of C25 steroid carboxylic acids
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β-Substituted propionic acids are prepared in good yields by carbon-carbon coupling reaction of the nickelacycle 1 with organic iodides and anhydrous manganese(II) iodide. This new reaction is used to the synthesis of C25 steroid carboxylic acids from C22 steroid iodides.
- Schonecker,Walther,Fischer,Nestler,Braunlich,Eibisch,Droescher
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p. 1257 - 1260
(2007/10/02)
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- Cycloaddition 1,3-dipolaire du dimethyldiazomethane sur des esters et nitriles polyeniques. Acces aux esters cis et trans chrysanthemiques a partir des esters δ-methylsorbiques Z et E
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The dipolar cycloaddition reaction of 2-diazopropane with several dienic and trienic dipolarophiles is described.Methyl sorbate and methyl δ-bromomethylsorbates lead solely to Δ2-pyrazolines which result from a direct "Michael" addition.Methyl δ-methylsorbates and the corresponding nitriles on the contrary give unexpectedly also Δ1-pyrazolines, via an inverse cycloaddition.These are conveniently transformed by thermolysis or photolysis into chrysanthemic esters or nitrile.In the case of the trienic ester 15, the cycloaddition permits the characterisation of two regioisomeric Δ1-pyrazolines, the direct adduct being however poorly stable.This allows nevertheless the study of their respective thermolysis.While the inverse adduct leads solely to a dienic chrysanthemic analog, the thermal fragmentation of the other one gives mainly, via di ?-methane rearrangement, an acyclic 1,4,6 triene ester.
- Franck-Neumann, Michel,Miesch, Michel
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p. 362 - 370
(2007/10/02)
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