16955-09-2Relevant articles and documents
Aluminium Oxide Supported on SBA-15 Molecular Sieves as Potential Lewis Acid Catalysts for Epoxide Ring Opening Using Aniline
Yadav, Rekha,Muralidhar, Akhila,Shamna,Aghila,Gurrala, Lakshmiprasad,Sakthivel, Ayyamperumal
, p. 1407 - 1415 (2018)
Abstract: A series of aluminium oxide (Al2O3)-supported SBA-15 molecular sieves were prepared using a one-step wet-impregnation method. Powder X-ray diffraction, nitrogen adsorption/desorption, infrared spectroscopy and ammonia TPD were used to investigate the structures and chemical natures of the surface-bound species. The FT-IR studies of metal-impregnated SBA-15 materials revealed strong covalent interaction of Al2O3 on SBA-15 materials with strong Lewis acidic properties, evident from ammonia-TPD studies. The metal oxide-supported SBA-15 catalysts are active for epoxide ring opening with aniline at room temperature, and showed remarkably high stability and selectivity towards mono-alkylated products (about 86%) viz., 1-(phenylamino)propan-2-ol and 2-(phenylamino)propan-1-ol. The catalytic activities remained intact after several recycles. The observed activities and selectivities were compared with other metal oxide-loaded SBA-15 catalysts obtained by similar preparation methods. Graphical Abstract: Aluminium oxide supported SBA-15 molecular sieves were prepared using a one-step wet-impregnation method. The materials showed strong Lewis acidic sites and promising catalytic activity for epoxide ring opening with aniline at room temperature. [Figure not available: see fulltext.]
In situ preparation, characterization, and catalytic application of various amine functionalized microporous SAPO-37
Ahmed, Maqsood,Yadav, Rekha,Sakthivel, Ayyamperumal
, p. 9298 - 9306 (2016)
A series of monoamine, diamine, and aniline functionalized microporous silicoaluminophosphate molecular sieves (SAPO-37) was prepared by introduction of organo-silane ligand during hydrothermal synthesis. The template was selectively removed by the solvent extraction method in the presence of sodium nitrate salt. The effective removal of the template was evident from FT-IR, and 13C MAS-NMR studies. The retention of high crystallinity was evident from the powder XRD pattern of the template-removed functionalized SAPO-37 materials. The functionalized materials showed a high surface area in the range of 200-300 m2g-1 with a pore volume of 0.2-0.4 cm3g-1. The functionalized SAPO-37 was found to be a potential catalyst for epoxide ring opening with aniline.
Highly Enantioselective Hydrogenation of Amides via Dynamic Kinetic Resolution Under Low Pressure and Room Temperature
Rasu, Loorthuraja,John, Jeremy M.,Stephenson, Elanna,Endean, Riley,Kalapugama, Suneth,Clément, Roxanne,Bergens, Steven H.
supporting information, p. 3065 - 3071 (2017/03/11)
High-throughput screening and lab-scale optimization were combined to develop the catalytic system trans-RuCl2((S,S)-skewphos)((R,R)-dpen), 2-PrONa, and 2-PrOH. This system hydrogenates functionalized α-phenoxy and related amides at room temperature under 4 atm H2 pressure to give chiral alcohols with up to 99% yield and in greater than 99% enantiomeric excess via dynamic kinetic resolution.