References
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- The yield is calculated on the basis of recovered 1a.
- This incomplete reduction may be attributed to the strong bonding of the aromatic ring with the active sites of platinum so that the reduction product cannot be desorbed.9 When platinum oxide was replaced by palladium/carbon, which binds less strongly to the aromatic ring, the hydrogenation of the double bond was complete within a short time (3h). The difference in the catalytic activity of palladium and platinum catalysts towards the hydrogenation of 5a and 5b is reminiscent of the reduction of phenyl-substituted ethylenes.9b
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