34 research outputs found

    Aqueous Catalytic Pauson-Khand-Type Reactions of Enynes with Formaldehyde: Transfer Carbonylation Involving an Aqueous Decarbonylation and a Micellar Carbonylation

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    One rhodium(I) complex catalyzes two processes in an overall Pauson-Khand-type reaction of enynes such as 1 with formaldehyde in an aqueous medium to give bicyclic cyclopentenones such as 2 in excellent yields. The use of a water-soluble phosphane ligand in conjunction with a hydrophobic phosphane ligand in the presence of a surfactant promotes the decarbonylation of formaldehyde in the aqueous phase and the carbonylation of enynes in the micellar phase

    Rh(i)-catalyzed CO gas-free cyclohydrocarbonylation of alkynes with formaldehyde to [small alpha],[small beta]-butenolides

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    The rhodium(I)-catalyzed reaction of alkynes with formaldehyde proceeds via the double incorporation of a carbonyl moiety from formaldehyde, resulting in a CO gas-free cyclohydrocarbonylation leading to α,β-butenolides

    Ru 3

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