Enantioselective Henry Reactions under Dual Lewis Acid/Amine
... Claudio Palomo,* Mikel Oiarbide, and Antonio Laso There is increasing interest in developing catalytic asymmetric C C bond-forming processes.[1] In this endeavor the Henry reaction[2] is prominent because of the versatile chemistry of the nitro group.[3] Remarkably, however, while this reaction is c ...
... Claudio Palomo,* Mikel Oiarbide, and Antonio Laso There is increasing interest in developing catalytic asymmetric C C bond-forming processes.[1] In this endeavor the Henry reaction[2] is prominent because of the versatile chemistry of the nitro group.[3] Remarkably, however, while this reaction is c ...
Catalysis by metals - Société Chimique de France
... In the early 70's it was shown that the IR spectroscopy of adsorbed CO was able to probe the electronic properties of metals thus allowing to evidence support and adsorbate effects12. The effect of support acidity on the properties of platinum and palladium clusters in zeolites was demostrated13. C ...
... In the early 70's it was shown that the IR spectroscopy of adsorbed CO was able to probe the electronic properties of metals thus allowing to evidence support and adsorbate effects12. The effect of support acidity on the properties of platinum and palladium clusters in zeolites was demostrated13. C ...
Physical Organic Chemistry
... Steric hindrance on alkyl halihes will prevent proton elimination hence the products is Zaitsev’s products which contain many substituted groups. The product with less substituted is more preferred (Hofmann) ...
... Steric hindrance on alkyl halihes will prevent proton elimination hence the products is Zaitsev’s products which contain many substituted groups. The product with less substituted is more preferred (Hofmann) ...
Document
... a Closed system, d8-toluene, 20 °C, t1/2 is the time required for the reaction to reach 50% of final constant ratio of 10 to 12. b Open driven condition, solvent 1,2,4-trichlorobenzene, 30 °C, 22 h, 1 mm Hg, yield based on isolated product. c Ligand A ) R,R,R-trifluoro-o-cresol. d Ligand B ) p-nitro ...
... a Closed system, d8-toluene, 20 °C, t1/2 is the time required for the reaction to reach 50% of final constant ratio of 10 to 12. b Open driven condition, solvent 1,2,4-trichlorobenzene, 30 °C, 22 h, 1 mm Hg, yield based on isolated product. c Ligand A ) R,R,R-trifluoro-o-cresol. d Ligand B ) p-nitro ...
Microsoft Word
... moderate catalyst activity for polymerization of ethylene and activity decreased in the order Zr>Ti>Hf. These complexes exhibited activity even at 100C. The zirconium complex produced poly(ethylene)s with exclusively saturated chain ends when the polymerization was conducted at 25-60C. The saturat ...
... moderate catalyst activity for polymerization of ethylene and activity decreased in the order Zr>Ti>Hf. These complexes exhibited activity even at 100C. The zirconium complex produced poly(ethylene)s with exclusively saturated chain ends when the polymerization was conducted at 25-60C. The saturat ...
CBS Reduction
... History of CBS reduction and selectivity • In 1981 Itsuno et al reduced achiral ketones to chiral alcohols using alkoxy-amine-borane complexes in enantioselectivity and in high yield. • In 1987 E.J. Corey, with his co-workers, used oxazaborolidines to rapidlly reduce ketones in the presence of BH3- ...
... History of CBS reduction and selectivity • In 1981 Itsuno et al reduced achiral ketones to chiral alcohols using alkoxy-amine-borane complexes in enantioselectivity and in high yield. • In 1987 E.J. Corey, with his co-workers, used oxazaborolidines to rapidlly reduce ketones in the presence of BH3- ...
