Chiral calcium catalysts for asymmetric hydroamination/cyclisation

2011 ◽  
Vol 47 (19) ◽  
pp. 5449 ◽  
Author(s):  
James S. Wixey ◽  
Benjamin D. Ward
Keyword(s):  
Calcium Catalysts

Calcium catalyzed enantioselective intramolecular alkene hydroamination with chiral C2-symmetric bis-amide ligands

2021 ◽  
Vol 50 (9) ◽  
pp. 3178-3185 ◽  
Author(s):  
Philipp C. Stegner ◽  
Jonathan Eyselein ◽  
Gerd M. Ballmann ◽  
Jens Langer ◽  
Jochen Schmidt ◽  
...  
Keyword(s):  
Enantioselective Catalysis ◽  
Amide Ligands ◽  
Calcium Catalysts

Enantioselective catalysis with calcium catalysts is challenging due to facile loss of the chiral spectator ligand. Herein a series of bis-amide calcium catalysts with chiral binaphtalene bridges is introduced.

scholarly journals Effect of catalyst on tail gas during reduction of vanadium-titanium magnetite carbon-containing pellet

2021 ◽  
Vol 267 ◽  
pp. 02046
Author(s):  
Bo Wang ◽  
Xueyong Ding ◽  
Xiaofei Zhang ◽  
Tianhua Ju ◽  
Shigang Li
Keyword(s):  
Rotary Kiln ◽  
Flue Gas ◽  
Reduction Process ◽  
Reduction Mechanism ◽  
Gas Analyzer ◽  
Metallization Rate ◽  
Vanadium Titanium ◽  
Reduction Effect ◽  
Calcium Catalysts ◽  
Titanium Magnetite

Catalyst can enhance the reduction effect and promote the reduction of vanadium titanomagnetite. In this paper, the carbon-containing pellets of vanadium titanomagnetite were prepared by using highly volatile coal as the reducing agent under the background of a novel process of pre-reduction in the rotary kiln. The effects of CaO, CaCO3, B2O3 and borax (Na2B4O7·10H2O) on the tail gas characteristics of carbon-containing pellets in the prereduction process were studied by using a simulated rotary kiln and flue gas analyzer. The results showed that the enhanced reduction effect of boron catalysts was slightly stronger than that of calcium catalysts, among which CaO catalyzed the least and borax the best. With the increase of metallization rate, the CO utilization in the tail gas is generally reduced, while when using CaCO3 as the catalyst, the CO utilization is significantly increased. Due to different reduction mechanism, the boron catalysts have little effect on the tail gas, and the calcium catalysts have a great effect on the tail gas. Based on the experimental results and the characteristics of the tail gas from the reduction process, we put forward the idea of using CaCO3 as the best catalyst and using CaO to absorb CO2 in the tail gas to form CaCO3.

Decomposition of ammonia with iron and calcium catalysts supported on coal chars

Fuel ◽  
2004 ◽  
Vol 83 (6) ◽  
pp. 685-692 ◽  
Author(s):  
Yasuo Ohtsuka ◽  
Chunbao Xu ◽  
Dapeng Kong ◽  
Naoto Tsubouchi
Keyword(s):  
Calcium Catalysts ◽  
Iron And Calcium

ChemInform Abstract: Chiral Calcium Catalysts for Asymmetric Hydroamination/Cyclization.

ChemInform ◽  
2011 ◽  
Vol 42 (37) ◽  
pp. no-no
Author(s):  
James S. Wixey ◽  
Benjamin D. Ward
Keyword(s):  
Calcium Catalysts
Sign in / Sign up

Export Citation Format

Share Document