104-53-0Relevant articles and documents
Cluster Catalysed Selective Transfer Hydrogenation of α,β-Unsaturated Aldehydes
Bhaduri, Sumit,Sharma, Krishna
, p. 173 - 174 (1988)
H4Ru4(CO)8L4 (L=PBun3) catalyses selective transfer hydrogenation of α,β-unsaturated aldehydes to α,β-unsaturated alcohols; kinetic and deuterium labelling studies indicate involvement of cluster intermediates and no participation by the cluster hydrides.
Novel C-C bond cleavage under mild, neutral conditions: Conversion of electron-deficient aryl alkyl ketones to aryl carboxylic esters
Zhang, Nan,Vozzolo, Joseph
, p. 1703 - 1704 (2002)
A novel, unique way to cleave the carbon-carbon bond in aryl alkyl ketones under mild, neutral conditions is described. Treatment of aryl alkyl ketones in a refluxing mixture of N,N-dimethylformamide dimethyl acetal and methanol for 16 h provided aryl car
Oxidative deprotection of tetrahydropyranyl and trimethylsilyl ethers in water using 1,4-dichloro-1,4-diazoniabicyclo[2,2,2]octane bis-chloride under neutral conditions
Tajbakhsh, Mahmood,Habibzadeh, Setareh
, p. 259 - 262 (2007)
The oxidative deprotection of trimethylsilyl and tetrahydropyranyl ethers in water using 1,4-dichloro-1,4-diazonia-bicyclo[2,2,2]octane bis-chloride as a new efficient reagent under neutral conditions is described. The DABCO was regenerated, rechlorinated and reused several times.
Synthesis and fungicidal activity study of novel daphneolone analogs with 2,6-dimethylmorpholine
Xu, Gao-Fei,Yang, Xin-Ling,Lei, Peng,Liu, Xi-Li,Zhang, Xue-Bo,Ling, Yun
, p. 555 - 558 (2016)
A series of novel daphneolone analogs was designed and synthesized on the basis of natural product 1,5-diphenyl-2-penten-1-one (I) from Stellera chamaejasme L. as lead compound, whereby 2,6-dimethylmorpholine moiety was introduced to replace 1-phenyl group. Their structures were confirmed by IR, 1H NMR, and HRMS (ESI) or elemental analysis, 13C NMR for some representative compounds. The two isomers of target compounds were separated and identified by NOESY technique and chemical method. All of the synthesized compounds have been evaluated for anti-plant pathogenic fungi activities. The results showed that some compounds exhibited moderate to good antifungal activities against tested fungi at the concentration of 50 mg/L. Among them, compound 7d, with a 4-bromine-substituted phenyl group and cis-2,6-dimethylmorpholine moiety, displayed best activity with an EC50 of 23.87 μmol/L against Valsa Mali, superior to lead compound I. In addition, preliminary structure-activity relationship analysis indicated that, between two isomers of target compounds, the antifungal activities of the isomer with cis-2,6-dimethylmorpholine were better than the trans-isomer.
Microwave-assisted fast fabrication of a nanosized Pt3Co alloy on reduced graphene oxides
Shi, Juanjuan,Nie, Renfeng,Zhang, Mengyuan,Zhao, Mengsi,Hou, Zhaoyin
, p. 2029 - 2037 (2014)
Ultrafine and homogenously dispersed Pt3Co alloy nanoparticles were fabricated on reduced graphene oxide (RGO) in a few minutes under microwave irradiation. Characterization results confirmed that microwave irradiation was important for higher metal utilization, the easy control of alloy composition, improved dispersion of the Pt3Co particles and minimizing the re-graphitization of the parent RGO by comparison with conventional solvent-thermal and impregnation methods. This Pt3Co/RGO-MW catalyst was extremely active and selective during the hydrogenation of cinnamaldehyde to cinnamyl alcohol. The calculated specific activity of each Pt atom in the Pt3Co/RGO-MW at 70 °C was 23.8 min-1.
Simple and efficient water soluble thioligands for rhodium and iridium catalyzed biphasic hydrogenation
Di Dio, Sabrina,Marchetti, Mauro,Paganelli, Stefano,Piccolo, Oreste
, p. 205 - 210 (2011)
The activity of catalytic systems derived from the interaction between Rh(CO)2acac and [Ir(COD)Cl]2, respectively, with the water soluble thioligands (L)-Cysteine (1) and (S)-Captopril (2), was tested in the aqueous biphasic hydrogenation of some representative α,β-unsaturated compounds as 2-cyclohexen-1-one (I), trans-cinnamaldehyde (V) and [3-(1,3-benzodioxol-5-yl)-2-methylpropenal] (X), precursor of the fragrance Helional (XI). The precatalyst Rh/Cap was able to hydrogenate cyclohexenone even at low pressure at 60 °C in a neutral medium while Rh/Cy required either higher pressure and temperature or an alkaline medium. The iridium based catalysts, Ir/Cy and Ir/Cap, showed an analogous trend though their activities were lower than those of the related rhodium catalysts. All the catalysts were easily recycled without significant loss of activity. The rhodium catalysts were also used in the hydrogenation of the above aldehydes V and X and their activity was strongly enhanced when ethylene glycol was used as organic solvent or co-solvent.
A hybrid polyketone-SiO2 support for palladium catalysts and their applications in cinnamaldehyde hydrogenation and in 1-phenylethanol oxidation
Antonetti, Claudia,Toniolo, Luigi,Cavinato, Gianni,Forte, Claudia,Ghignoli, Chiara,Ishak, Randa,Cavani, Fabrizio,Raspolli Galletti, Anna Maria
, p. 40 - 50 (2015)
An organic-inorganic hybrid material, PK-SiO2 (PK = polyketone), was employed as support for Pd catalysts. Their synthesis was carried out by MW irradiation of an ethanol solution of Pd(OAc)2 in the presence of the support. The obtai
Nanosized transition metals in controlled environments of phyllosilicate-mesoporous silica composites as highly thermostable and active catalysts
Ciotonea, Carmen,Dragoi, Brindusa,Ungureanu, Adrian,Chirieac, Alexandru,Petit, Sabine,Royer, Sebastien,Dumitriu, Emil
, p. 7665 - 7667 (2013)
Stabilization of transition metals in nano-phyllosilicate phases generated by digestion of mesoporous silica is reported as an efficient route for the formation of highly dispersed metallic nanoparticles with outstanding catalytic activity. The Royal Society of Chemistry.
Asymmetric hydroformylation of styrene catalyzed by carbohydrate diphosphite-Rh(I) complexes
Dieguez, Montserrat,Pamies, Oscar,Ruiz, Aurora,Claver, Carmen
, p. 827 - 833 (2002)
A series of new chelating diphosphite ligands with a furanoside backbone and axially chiral biphenyl or binaphthyl moieties have been synthesized. Their Rh(I) complexes have been tested as catalyst precursors for the asymmetric hydroformylation of styrene. Systematic variation in chirality at both chiral sugar backbone stereocenters (C-3 and C-5) and either the axial chiral biphenyl or binaphthyl substituents revealed a remarkable effect on the selectivity of the hydroformylation catalysts. In this way, by judicious choice of these elements, both regio- and enantioselectivities can be optimized. Thus, both high enantioselectivity (up to 93% S) and regioselectivity in 2-phenylpropanal (up to 98.8%) were found under mild reaction conditions (15-40°C, 10 bar of syngas) for the ligand with a glucofuranoside backbone and bis(trimethylsilyl)-2,2′-biphenyl moiety. The solution structures of HRh(L-L)(CO)2 complexes have been studied by high pressure NMR and IR. Varying the configuration of the binaphthyl moieties revealed a remarkable effect on the diphosphite coordination modes on the intermediate HRh(L-L)(CO)2 species and, therefore, on enantioselectivity. Enantioselectivity was highest for ligands with a strong bis-equatorial coordination preference.
Dendritic nanoreactor encapsulating Rh complex catalyst for hydroformylation
Mizugaki, Tomoo,Miyauchi, Yasuaki,Murata, Makoto,Ebitani, Kohki,Kaneda, Kiyotomi
, p. 286 - 287 (2005)
A Rh phosphine complex was encapsulated within the surface alkylated poly(propylene imine) dendrimers through ionic interactions. The resulting dendrimer complexes functioned as nanoreactors for hydroformylation of olefins. The congested surface of dendrimers with long alkyl chains favored hydroformylation of higher olefins. One-pot three reactions composed of hydroformylation, the Knoevenagel reaction, and hydrogenation proceeded within the dendritic nanoreactor. Copyright
