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The regioselective hydroformylation of allyl alcohol was performed using conventional Rh/PPh 3 catalyst in an ionic liquid film supported on silica (Rh/PPh 3 /SILPC), with water as a reaction medium. Subsequently, the hydroformylation products were hydrogenated using a Ru/PPh 3 /SILP catalyst to give 1,4-butanediol. The effects of various reaction parameters such as the P/Rh ratio, the substrate/Rh ratio, the temperature, the pressure, and various immobilizing agents on the chemoselectivity and regioselectivity for hydroformylation of allyl alcohol were studied. Extension of this methodology to the hydroformylation of various methyl-substituted allylic alcohols was also studied. Very high conversion and selectivity toward n -aldehyde can be achieved using the present heterogenized homogeneous catalyst system.
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Panda et al. (2008) studied this question.
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