The
development of inexpensive and sustainable aluminum(salen)
complexes as catalysts for the kinetic resolution of terminal epoxides
is described. The kinetic resolution is carried out under mild conditions
(0–25 °C and 1 bar of CO2 pressure) in the
presence of tetrabutylammonium bromide as co-catalyst in the absence
of solvent. The relative rate of reaction of the two epoxide enantiomers
(k
rel) is substrate dependent, and the
highest k
rel obtained was 15.4, using N-(2,3-epoxypropyl)diphenylamine as substrate.
Mesoporous carbonaceous materials (Starbons®) derived from low-value/waste bio-resources separate CO2 from CO2 /N2 mixtures. Compared to Norit activated charcoal (AC), Starbons® have much lower microporosities (8-32 % versus 73 %) yet adsorb up to 65 % more CO2 . The presence of interconnected micropores and mesopores is responsible for the enhanced CO2 adsorption. The Starbons® also showed three-four times higher selectivity for CO2 adsorption rather than N2 adsorption compared to AC.
Mesoporous carbonaceous materials (Starbons ) derived from low-value/waste bio-resources separate CO 2 from CO 2 /N 2 mixtures.C ompared to Norit activated charcoal (AC), Starbons have much lower microporosities (8-32 % versus 73 %) yet adsorb up to 65 %more CO 2 .The presence of interconnected micropores and mesopores is responsible for the enhanced CO 2 adsorption. The Starbons also showed three-four times higher selectivity for CO 2 adsorption rather than N 2 adsorption compared to AC.Supportinginformation for this article can be found under: http://dx.
Five-coordinate aluminium(salen) complexes have dynamic structures which interconvert by intramolecular salen ligand rearrangement involving square-based pyramidal and trigonal bipyramidal conformations.
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