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- All compounds gave satisfactory TLC, HPLC, 1H NMR, 13C NMR, mass spectral, and elemental analysis data, in agreement with their assigned structures. .
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- Catalytic hydrogenation of the enol ethers to the isopropyl ethers was also both clean and efficient using palladium on barium sulphate 5%, palladium on charcoal 5%, palladium on charcoal 5% buffered with triethylamine, and the Lindlar catalyst. The milder catalysts are to be prefered when H2 sensitive protecting groups are present in the substrate.