By Ivan Bernal (Eds.)
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Extra resources for Chemical Bonds–Better Ways to Make Them and Break Them
This mixture is unexpectedly superior to the anticipated additive effects of the individual metal complexes. This reaction is also temperature dependent [99, 100b]. Improved catalytic activities have been observed with the mixed clusters HRuCo3(CO) 12 (53) and M[RuCo3(C O )12] (69a-e) promoted by methyl iodide, compared with those for Co2(C O )8 or Ru3(C O ) 12 alone [99, 151-153, 300]. The yield of ethanol depends upon the nature of the cation employed , Another Ru-Co mixed cluster, 70a, gave lower yield of ethanol under the same conditions [152, 153], Although consistent transformations (eq.
The complexes 58a and 58b could be recovered after catalysis [276, 277]. t-B u t-B u (O C )R h R h (C O ) / \ P h 9P 58a , X = Zr(Cp)2 PPh n 58b , X = A synergic effect [Et4N ][F e C o3(C O )12] was observed when -C H 2-C H 2- the mixed-metal cluster (59b) was used as catalyst in the hydroformylation of cyclohexene to yield cyclohexanecarbaldehyde (CHC) (eq. 9). In com parison, structure, [Et4 N ] [ F e 3C o ( C O ) 13] (60 b), which exhibited has also a tetrahedral little activity. Addition of Fe3 ( C O ) 12, with or without 33 [B u 4 N]CI, to C o 2 ( C O ) 8 did not improve the activity .
D Ru, 6 x 10"4 g. atom. e T = 130 °C. f Benzene as solvent, 10 mL. 9, a similar synergic effect was (53) w as assembling investigated in also the observed. pre s en c e The of activity of H R u C o 3 ( C O ) 12 tr iphenylphosphine ligand tris(d iphenylphosphino)m ethane, or of the expected to maintain the metals in close proximity. The results were similar to those obtained for the F e C o 3 cluster 5 9 b . in creasing the R u /C o H o w e v e r, ratio the [1 5 0 , activity 1 51 ]. w as The greatly improved h ydrofo rm ylatio n by when the 34 bimetallic catalysts was remarkably influenced by the nature of the solvent used, and alcohols such as methanol and ethanol were the best among the solvents employed .