477218-66-9Relevant academic research and scientific papers
Assignment of pre-edge features in the Ru K-edge X-ray absorption spectra of organometallic ruthenium complexes
Getty, Kendra,Delgado-Jaime, Mario Ulises,Kennepohl, Pierre
, p. 1059 - 1065 (2008)
The nature of the lowest energy bound-state transition in the Ru K-edge X-ray absorption spectra for a series of Grubbs-type ruthenium complexes was investigated. The pre-edge feature was unambiguously assigned as resulting from formally electric dipole forbidden Ru 4d ← 1s transitions. The intensities of these transitions are extremely sensitive to the ligand environment and the symmetry of the metal centre. In centrosymmetric complexes the pre-edge is very weak since it is limited by the weak electric quadrupole intensity mechanism. By contrast, upon breaking centrosymmetry, Ru 5p-4d mixing allows for introduction of electric dipole allowed character resulting in a dramatic increase in the pre-edge intensity. The information content of this approach is explored as it relates to complexes of importance in olefin metathesis and its relevance as a tool for the study of reactive intermediates.
A practical synthesis of D-erythro-sphingosine using a cross-metathesis approach
Torssell, Staffan,Somfai, Peter
, p. 1643 - 1646 (2007/10/03)
Starting from a vinylepoxide, a short and practical synthesis of D-erythro-sphingosine is described. The key transformations are a regioselective opening of the vinylepoxide and an E-selective cross-metathesis, affording the target molecule in 5 steps and 51% overall yield.
