Abstract
The homogeneous and heterogeneous hydrogenation of 1-octene was studied using phosphido-stabilized ruthenium clusters as catalysts. All four phosphido-stabilized ruthenium clusters Ru 2(CO) 6[1,2-(μ-PPh) 2C 6H 4] ( 1), Ru 3(CO) 6[1,2-(μ-PPh) 2C 6H 4] 2 ( 2), Ru 2(CO) 6[1,2-(μ-P tBu 2C 6H 4] ( 3), and Ru 3(CO) 6[1,2-(μ-P tBu 2C 6H 4] 2 ( 4) were found to be active hydrogenation and isomerization catalyst precursors, but no hydrogenolysis was observed even at elevated temperatures. The polar environment of the Cab-o-sil (silica) support activated the triruthenium cluster 2 in comparison with the homogeneous hydrogenation of 1-octene. Addition of a Lewis acid (Et 2O:BF 3) to the homogeneous hydrogenation of 1-octene resulted in modestly higher catalytic activity of 2. Compound 2 was quantitatively recovered from the Cab-o-sil support intact after hydrogenating 1-octene at 140°C for several hours.
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