ChemInform Abstract: HIGHLY SELECTIVE CARBON‐CARBON BOND FORMING REACTIONS MEDIATED BY CHROMIUM(II) REAGENTS

Abstract

Ein durch die Reduktion von Cr(III) mit LiAlH4 hergestelltes Reagenz vennittelt die Bildung von Homoallylalkoholen, wie z.B. (III), aus Carbonylverbindungen und Allylbromid‐Derivaten.

Unexpected dissociative kinetics for carbon monoxide exchange in the 17-electron complexes carbonylbis(.eta.5-pentadienyl)vanadium(II), carbonyl(.eta.5-cyclopentadienyl)(.eta.5-pentadienyl)vanadium(II), and carbonyl(.eta.5-cyclopentadienyl)(.eta.5-2,4-dimethylpentadienyl)vanadium(II)

“…1961, 83, 520-528. (14) philicities in these complexes, with vanadium in complexes 4 and 5 exhibiting greater electrophilicity. Given the inclination of other 17-electron metal carbonyl complexes to undergo associative ligand displacement reactions, it seems ironic that the incorporation of a pentadienyl ligand, which would be expected to promote associative attack via rf -*• 3 coordination changes, should lead instead to a series of compounds for which much lower rates of substitution are observed and for which the substitutions also take place via dissociative means.…”