Hydroformylation of hex-1-ene catalysed by [RhH(PEt3)3] or [Rh2(OAc)4]/PR3, R = Me, Et, or Bu, produces a mixture of aldehydes and alcohols in toluene or tetrahydrofuran but exclusively alcohols in ethanol; [Rh2(OAc)4] or [RhH(CO)(PPh3)3] produce mainly aldehydes or acetals when ethanol is used as the solvent.
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MacDougall et al. (1990) studied this question.
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