Substituted N,N‐Chelate Ligands ‐ Applications in Molybdenum‐Catalyzed Epoxidation of Olefins* Oxodiperoxomolybdenum complexes 4 of substituted 2‐[3(5)‐pyrazolyl]pyridines (2a‐g) were synthesized in order to control the solubility of these complexes in organic solvents. Alkyl side chains (butyl, octyl, octadecyl) increase the solubility of the complexes and enable spectroscopic investigations in solution. Due to the symmetry of the ligands the peroxo complexes 4 appear in two isomeric forms, with the terminal oxo ligand in the trans position either to pyridine or to pyrazole. The latter isomer of (C5H4NC3H2N2CH2COOEt)MoO(O2)2 (4f) was characterized by an X‐ray structure analysis. The alkyl‐substituted peroxo complexes are active catalysts for the epoxidation of olefins with tert‐butyl hydroperoxide.
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Thiel et al. (1994) studied this question.
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