catalyst system
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Synthesis ◽  
2022 ◽  
Author(s):  
Zhi-Wei Ma ◽  
Chuan-Chuan Wang ◽  
Quan-Jian Lv ◽  
Xiao-Pei Chen ◽  
Ai-Qin Li ◽  
...  

AbstractA new tertiary amine-squaramide organocatalyst has been developed and applied to the asymmetric Michael addition of cyclic diketones to β,γ-unsaturated α-keto esters. The catalyst system performed well with a low catalyst loading of 1 mol% under mild reaction conditions. A series of synthetically and pharmaceutically useful chiral bicyclic compounds were obtained in high yields (up to 97%) with excellent enantioselectivities (up to 99 % ee). Furthermore, this catalytic system can be used efficiently in large-scale reactions with the yields and enantioselectivities being maintained.


2022 ◽  
Author(s):  
Chandran Rajendran ◽  
Satish Kumar G

A heterogeneous iron-catalyzed (8wt%Fe/SBA-15) mediated direct alkylation of benzyl alcohol with aryl boronic acid in the absence of base and additive via C-O bond activation is demonstrated. This catalyst system led to an efficient Friedel-crafts alkylation reaction. The acidic site in the catalyst system had been confirmed by NH3-TPD, which shows the presence of three different acidic sites viz., weak, moderated, and strong acid sites. The catalyst showed five times recyclable ability.


2022 ◽  
pp. 379-382
Author(s):  
A Burrows ◽  
A Pantazidis ◽  
C Mirodatos ◽  
C J Kiely

2022 ◽  
Vol 16 (3) ◽  
pp. 234-247
Author(s):  
Oihane Echeverria-Altuna ◽  
Olatz Ollo ◽  
Tamara Calvo-Correas ◽  
Isabel Harismendy ◽  
Arantxa Eceiza

2022 ◽  
Author(s):  
A. Ziyaei Halimehjani ◽  
B. Breit

Regioselective and enantioselective addition of thioacids to terminal allenes is reported employing a rhodium(i)/DIOP catalyst system. Complete catalyst control of diastereoselectivity was achieved upon addition of chiral amino thioacids to allenes.


Author(s):  
David Decker ◽  
Zhihong Wei ◽  
Jabor Rabeah ◽  
Hans-Joachim Drexler ◽  
Angelika Brückner ◽  
...  

Herein we report the application of a Co(II) PNNH pincer catalyst system (PNNH = 2-(5-(t-butyl)-1H-pyrazol-3-yl)-6-(dialkylphosphinomethyl)pyridine) for the highly E-selective transfer semihydrogenation of internal diaryl alkynes using methanol and ammonia borane...


2021 ◽  
Vol 37 (6) ◽  
pp. 1262-1279
Author(s):  
Mayankkumar Lakshmanbhai Chaudhary ◽  
Rawesh Kumar

As ceria chemistry broadens, it is needed to generalize the behavior of ceria surfaces towards molecules for carrying out a reaction. The endowing capacity of mobile oxygen due to rapid redox switching between Ce+4/Ce+3 is a key point for ceria containing surfaces. Herein we have presented a review which is broadly divided into two parts. First part focuses on surface property as how electronic structure, vacancy and surface energy would be modified after interaction of ceria with dopant (noble metal, metal of variable oxidation state, higher valent metal and lower valent metal). The second part focuses on catalysis as how the doped ceria surface influences the carbon monoxide transformations (CO oxidation, CO and H2O reaction, CO and NO reaction, CO and H2 reaction). This through study will be helpful to predict the ceria surface for a designed reaction.


2021 ◽  
Author(s):  
Chandran Rajendran ◽  
Satish Kumar G

A heterogeneous iron-catalyzed (8wt%Fe/SBA-15) mediated direct alkylation of benzyl alcohol with aryl boronic acid in the absence of base and additive via C-O bond activation is demonstrated. This catalyst system led to an efficient Friedel-crafts alkylation reaction. The acidic site in the catalyst system had been confirmed by NH3-TPD, which shows the presence of three different acidic sites viz., weak, moderated, and strong acid sites. The catalyst showed five times recyclable ability.


Author(s):  
D. N. Nebykov ◽  
Yu. V. Popov ◽  
V. M. Mokhov ◽  
E. V. Shepotko ◽  
D. S. Kos'yanenko

The process of mesityl oxide hydrogenation in the presence of a nickel catalyst prepared by impregnating a support with an aqueous solution of the corresponding salt in a displacement reactor in a gas-liquid-solid catalyst system has been studied. It has been established that the use of the catalyst used in the work makes it possible to selectively obtain methyl isobutyl ketone with complete conversion of mesityl oxide in the temperature range 70-100 ºС.


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