Triethylamine → 3-(1-Undecynyl)benzaldehyde

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-bromobenzaldehyde (51.8 g), 1-undecyne (48.6 g), bis(triphenylphosphine)palladium(II)chloride (3.37 g), copper iodide (457 mg), and triethylamine (196 ml) in dry tetrahydrofuran (300 ml) was stirred for 4 hrs at 55° C. The reaction mixture was filtered, the filtrate was diluted with ethyl acetate, and the solution was washed with water and brine. The organic phase was dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated in vacuo. The residue was chromatographed on 300 g of silica gel (1:4-ethyl acetate:hexane). The appropriate fractions were collected and evaporated. Distillation of a 40-g sample of the residue (81.3 g) gave 9.5 g (13%) of the product, bp 172°-174° C. (0.5 mm mercury).

Provenance & Evidence