Reduction of 1-hexene with Cp3Ln/NaH (Cp = cyclopentadienyl, Ln = rare earth metals) in THF at 45°C, after hydrolysis, gives hexane. The reducing activity of Cp3Ln depends strongly upon the ionic radius of the trivalent rare earth ion. The activity and selectivity of early rare earths for 1-hexane reduction are higher than those of heavy rare earths. The Cp3Ln/NaH systems can be used to regioselectively
The present invention relates to the use of specific organic compounds as flavor and fragrance material. Furthermore the invention relates to new specific organic compounds, as well as to flavor and fragrance formulations comprising at least one of the specific organic compounds.
Bis(phosphine)cobalt Dialkyl Complexes for Directed Catalytic Alkene Hydrogenation
作者:Max R. Friedfeld、Grant W. Margulieux、Brian A. Schaefer、Paul J. Chirik
DOI:10.1021/ja507902z
日期:2014.9.24
ligands, (P-P)Co(CH2SiMe3)2, are active for the hydrogenation of geminal and 1,2-disubstituted alkenes. Hydrogenation of more hindered internal and endocyclic trisubstituted alkenes was achieved through hydroxyl group activation, an approach that also enables directed hydrogenations to yield contrasteric isomers of cyclic alkanes.
带有双齿膦配体 (PP)Co(CH2SiMe3)2 的平面低自旋钴 (II) 二烷基配合物对孪生和 1,2-二取代烯烃的氢化具有活性。更多受阻的内部和环内三取代烯烃的氢化是通过羟基活化实现的,这种方法也使定向氢化产生环状烷烃的对比异构体。