145514-75-6Relevant academic research and scientific papers
Chiral molybdenum(VI) and tungsten(VI) 2′-pyridinyl alcoholate complexes. Synthesis, structure and catalytic properties in asymmetric olefin epoxidation
Herrmann, Wolfgang A.,Haider, Joachim J.,Fridgen, J?rg,Lobmaier, Gerhard M.,Spiegler, Michael
, p. 69 - 79 (2007/10/03)
A new class of chiral molybdenum(VI) and tungsten(VI) complexes of the type MO2L*2 (M = Mo, W; L* = chiral 2′-pyridinyl alcoholate), available through several synthetic pathways, and their catalytic behavior in the asymmetric epoxidation of unfunctionalized olefins are reported. MO2Cl2, MO2(acac)2, and Na2[MO4] (M = Mo, W) served as starting materials for the synthesis of the chiral molybdenum(VI) or tungsten(VI) complexes, respectively. The new oxo complexes were fully characterized including X-ray crystallographic analyses. The chiral 2′-pyridinyl alcoholate ligands were derived from either (-)-menthone, (-)-fenchone, (-)-camphor or (+)-camphor. For catalytic runs in the enantioselective epoxidation, trans-methylstyrene was used as model substrate and tert-butylhydroperoxide as the oxidant. The molybdenum complexes exhibit good catalytic activity and substantial optical induction. By way of contrast, the analogous tungsten complexes have low activities at comparable optical yields.
Diastereoisomeric Pure 2-(1-Hydroxyalkyl)pyridines as Catalysts in the Enantioselective Addition of Diethylzinc to Aldehydes
Chelucci, Giorgio,Soccolini, Franco
, p. 1235 - 1238 (2007/10/02)
Diastereoisomeric pure 2-(1-hydroxyalkyl)pyridines have been prepared from chiral ketones and checked as enantioselective catylysts in the addition of diethylzinc to aldehydes: enantioselectivities up to 82percent were obtained.
