Otto Roelen als Wegbereiter der industriellen homogenen Katalyse

A General and Efficient Iridium‐Catalyzed Hydroformylation of Olefins

“…[3] Until the early 1970s, when the first rhodium-based processes were commercialized, cobalt catalysts dominated academic and industrial hydroformylation chemistry. Since then, both in industry and in academic laboratories, the majority of studies have focused on rhodiumbased catalysts.…”

Insights into the Induced Ultrafast Electron Delocalization in Fe(CO)5 Using Dark Channel Fluorescence Yield X‐Ray Absorption

“…We are showing that the DCFY, for this compound, in solution, is due to a weak interaction of Fe(CO) 5 with the solvent n-hexane, while it disappears when the solvent-Fe(CO) 5 interaction is stronger, as in the case of tetrahydrofurane (THF).…”

“…Deviations be- Figure 1. Comparison of the L 2,3 -edge X-ray absorption spectra of Fe(CO) 5 in n-hexane (gray) and tetrahydrofurane THF (black). Explanation of the spectra and assignment of the signals are given in the text (also see Figure 2).…”

“…The dip peaks represent the MOs that are responsible for the electron transfer from the Fe centre to the CO ligand. To assign the nature of these MOs, we base our analysis on the previous well-established MOs for Fe(CO) 5 , using the linear combination of atomic orbitals and CI calculations for L-edge XAS. [34] Briefly, the D 3h symmetry of the Fe 3d orbitals (on the left side of Figure 2) split into one unoccupied a 1 ' (3d z 2 ) and two filled e" (3d xz , 3d yz ) levels lying below the e' state (3d x 2 Ày 2 , 3d yz ).…”

“…They are, for example, applied in medicine [1] as well as in catalysis, [2] where they play a key role as reactive intermediates, [3,4] such as in the Fischer-Tropsch synthesis [4][5][6][7][8] or catalytic CO removal from exhaust gases. [9,10] The properties of these complexes depend on the electronic structure at the central metal atom, which controls the interaction with other molecules, such as reactants in catalytic reactions.…”