Abstract
Rh-catalyzed hydroformylation of different olefins toward the corresponding aldehydes were performed under syngas atmosphere in the presence of triethylamine (Et3N) as additive. The influence of various reaction parameters including the phosphine ligands, solvents, additives have been investigated. It was found that, by involving Et3N as additive in the [Rh(cod)Cl]2/PPh3 catalytic system, the conversion of substrates (including cyclic, internal and linear olefins, up to 99%) and chemo/regioselectivity of the products were improved (up to 99%), the applicability for the synthesis of important aldehydes was wider in the absence of solvent. More importantly, the catalytic system could be recycled more than 7 times through vacuum distillation operation and provided a new synthesis method for the pesticide dinotefuran (Tetrahydrofuran-3-formaldehyde) and perfume (Lily aldehyde) intermediates.
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