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• W2004599986 abstract "Rhodium-catalyzed tandem hydroformylation/acetalization of a series of para-menthenic terpenes, i.e., α-terpinene (1), γ-terpinene (2), terpinolene (3), and limonene (4), has been studied in ethanol solutions in the presence of PPh3 or P(O-o-tBuPh)3 as auxiliary ligands. Limonene gives a corresponding acetal in high yields in both systems. The reaction with conjugated diene 1 occurs in the presence of PPh3 at a reasonable rate giving aldehydes and acetals only as minor products. On the other hand, non-conjugated dienes 2 and 3 has showed an extremely low reactivity in the Rh/PPh3 system. The use of P(O-o-tBuPh)3 not only remarkably accelerates the hydroformylation of all four substrates but also increases significantly the acetalization activity of the catalytic system. With the Rh/P(O-o-tBuPh)3 system, the mixtures of fragrance acetals have been obtained from substrates 1–3 in excellent combined yields, with two or three main acetals accounting for 70-85% of the mass balance for each substrate. The process is performed under mild conditions and in the absence of acid co-catalysts. The hydroformylation of all substrates in ethanol solutions was found to be much faster than in toluene." @default.
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• W2004599986 date "2010-05-01" @default.
• W2004599986 modified "2023-10-18" @default.
• W2004599986 title "Tandem hydroformylation-acetalization of para-menthenic terpenes under non-acidic conditions" @default.
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• W2004599986 doi "https://doi.org/10.1016/j.apcata.2010.03.045" @default.
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