Intramolecular alkoxycobaltation: a novel route to the cobalt–carbon bond in a coenzyme B₁₂model

Abstract

Coll(salen)t derivatives whose ethanediyl moiety carries an o-alkenyl side chain react with oxygen and methanol or ethanol t o give, via interaction between intermediate Colll species and the pendant olefin, alkylated products with a P-alkoxy substituted carbon bridge between cobalt and the equatorial ligand; the corresponding intermolecular reaction between Coll(salen) and hex-I-ene does not take place.

Surface-modified Improvement in Catalytic Performance of Cr(salen) Complexes Immobilized on MCM-41 in Solvent-Free Selective Oxidation of Benzyl Alcohol

“…2). This was similar to related metal salen compounds described in the literature [25,26], indicating the successful preparation of Cr(salen) complexes. The UV-vis spectra of all immobilized complexes were quite similar to the spectrum of neat complex, further confirming that the immobilized chromium Schiff base complexes as depicted in Scheme 1 were all successfully prepared.…”

Selective Oxidation of Glycerol with 3% H2O2 Catalyzed by LDH-Hosted Cr(III) Complex

“…Completely different from the UV-vis spectrum of the LDH carrier, the homogeneous complex displayed a peak at about 410 nm typical of the metal-ligand band and a broad peak at about 580 nm associated with d-d transitions (see Figure 2). This was similar to related metal salen compounds described in the literature [22,23], indicating the successful preparation of the Cr(III) complex. The UV-vis spectrum of the LDH-hosted complex was quite similar to the spectrum of the neat complex, further confirming that the LDH-hosted complexes were all successfully prepared.…”

Anchoring of Fe(III)salicylamide onto MCM-41 for Catalytic Hydroxylation of Phenol in Aqueous Medium Using Hydrogen Peroxide as Oxidant

“…A similar type of results are also found inFe(III)salicylamide-MCM-41 and Fe(III)salicylamide but with slightly less intense, which could be attributed to attachment of metal to nitrogen and oxygen. The broad band around 580 nm in Fe(III)salicylamide-MCM-41 may be assigned to the d-d transition in metal as reported in the literature[23][24][25][26].…”