Darstellung, Eigenschaften und Struktur des Cyclopentadienyl(1.3-diborolenyl)nickel-Sandwiehs [1] / Synthesis, Properties and Structure of the Cyclopentadienyl(1,3-diborolenyl)nickel Sandwich [1]

Abstract

<jats:title>Abstract</jats:title><jats:p> 1,3,4,5-Tetraethyl-2-methyl-1,3-diborolene (5) reacts with nickelocene and dimeric cyclopentadienylcarbonylnickel, yielding orange red 4 a, a diamagnetic nickelocene analogue. <jats:sup>1</jats:sup>H and <jats:sup>11</jats:sup>B NMR data indicate a sandwich structure, which is confirmed by X-ray structure analysis. The title compound crystallizes in the space group Pnma with a = 9.265(I), b = 15.1343(9), c = 12.777(2) Å and four molecules in the unit cell. All metal carbon distances are similar to those of the isoelectronic ferrocene.</jats:p>

Synthesis of 1,2-Dihydro-1,2-azaborines and Their Conversion to Tricarbonyl Chromium and Molybdenum Complexes

“…The structure of 15 and those of most coordinated boron heterocycles shows similar displacements of the boron atoms away from the transition metals. , The B−Cr distance of 6c (2.366(5) Å) is somewhat longer than the C−Cr distances (2.16−2.25 Å) and the Cr−N distance (2.20 Å). This is consistent with the larger size of boron and conforms to the pattern shown by other heterocyclic boron ligands …”