triphenylphosphine; bis(dibenzylideneacetone)-palladium(0) in 1,4-dioxane T=100°C; 16 h; Inert atmosphere;

1: With cerium(III) chloride in acetonitrile 18 h; Heating / reflux; 2: With hydrogenchloride in water; acetonitrile

tetrakis(triphenylphosphine) palladium(0); tris(4-methylphenyl)-phosphine in 1,4-dioxane T=100°C; 12 h; Inert atmosphere;

tetracarbonylbis(μ-chloro)dirhodium(I); bis(1,1-diphenylphosphino)methane in ethylene glycol dimethyl ether T=65°C; 16 h; Inert atmosphere; Overall yield = 79 percentSpectr.; stereoselective reaction;

1: diethyl ether; tetrahydrofuran / 0.5 h / 0 - 20 °C / |Inert atmosphere 2: sodium hydrogencarbonate; Dess-Martin periodane / dichloromethane / 0.33 h / 20 °C 3: bis(1,1-diphenylphosphino)methane; tetracarbonylbis(μ-chloro)dirhodium(I) / ethylene glycol dimethyl ether / 16 h / 65 °C / |Inert atmosphere View Scheme

1: sodium hydrogencarbonate; Dess-Martin periodane / dichloromethane / 0.33 h / 20 °C 2: bis(1,1-diphenylphosphino)methane; tetracarbonylbis(μ-chloro)dirhodium(I) / ethylene glycol dimethyl ether / 16 h / 65 °C / |Inert atmosphere View Scheme

aluminium trichloride Friedel-Crafts acylation;