By Ivan Bernal (Eds.)
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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 . In iron-rhodium bimetallic systems, presence of iron was observed. 1). It thus appears that under catalytic conditions, fragmentation of the Fe3Rh cluster occurs, resulting in the formation of Rh4 ( C O ) 12 [ 10b].
1 mmol. In the case of the cobalt-palladium cluster C o 2 P d ( D P P E ) ( C O ) 7 (7 5 ), the rate of methanol carbonylation to acetaldehyde increased compared with C o 2 ( C O ) 8 or Co4 ( C O ) 12 but the reduction of the latter to ethanol was not en han ced . On cluster 2 6 slightly increased the yield of ethanol [153, 300]. the other hand, use of the corresponding 26 , Μ = Pt 75 , Μ = Pd cobalt-platinum 47 2. 7. NORBORNADIENE DIMERIZATION Several c o b a lt- or iro n -co n ta in in g c o m p le x e s a re catalytic, stereospecific dimerization of norbornadiene (N BD ) capable of (eq.
0 M o lar ratio. d Initial e 2 -P h e n y lp ro p a n a l / 3 -p h e n ylp ro p a n al - hydroformylation rate expressed as mol aldehyde per mol cluster per h. In the m olar ratio. hydroform ylation of formaldehyde, the bim etallic cluster C o 2R h 2( C O ) 12 (3) provided an unexpected result: although it shows an activity only slightly greater than expected for a system formed from equimolar amounts of Co4(C O ) 12 and Rh4(C O ) 12 behaving independently, it greatly alters the product distribution and produces both glycolaldehyde and ethylene glycol with an overall molar selectivity of ca.