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Natural Cyclopropanes.—Ficini etal. have outlined a new approach to chrysaU themic acid ester (11) from commercially available 2,5-dimethyl-3-hexyn-2,5-diol, which has as a key stage the palladium-catalysed alkylation of the sulphone ester (10) with the acetate (9) (Scheme 3). cw-Chrysanthemic acid (14, R = H), is obtained by hydrogenation of the cyclopropene (13) produced by addition of diazopropane to the enyne (12). ... [Pg.259]

See other pages where Enyne sulphones, addition is mentioned: [Pg.58] [Pg.16]