86972-73-8Relevant academic research and scientific papers
Chiral Clusters with μ3-Alkyne and μ3-Vinylidene Ligands
Albiez, Thomas,Bernhardt, Wolfgang,Schnering, Christine von,Roland, Eckehart,Bantel, Harald,Vahrenkamp, Heinrich
, p. 141 - 152 (2007/10/02)
By reaction of alkyne-bridged dicobalt complexes with Fe2(CO)9 or Fe3(CO)12 alkyne- and vinylidene-bridged clusters of the general type FeCo2(CO)9(μ3-L) were accessible.These and the homologous RuCo2 clusters could be subjected to the reaction types metal exchange and alkyne-vinylidene rearrangement.Combination of both reaction types in the appropriate sequence yielded altogether 16 new hetero trinuclear clusters with μ3-alkyne ligands and 29 corresponding compounds with μ3-vinylidene ligands.Internal alkynes R2C2 with R = Me, Et, Ph and terminal alkynes HC2R with R = H, Me, t-Bu, Ph were used; the latter were also the precursors of the corresponding vinylidene ligands.The resulting metal frameworks were of the FeCoNi, FeCoMo, FeCoW, RuCoNi, RuCoMo, RuCoW, FeNi2, and FeCo2 types.The alkyne-vinylidene rearrangements on the chiral clusters showed diastereoselectivities between 0 and 100percent.The crystallographically determined molecular structure of RuCoWCp(CO)8(μ3-CCH-t-Bu) allows to interprete the diastereoselectivity as not resulting from steric effects.
