(E)-4-oxopent-2-enoyl chloride

Conditions: temp:-15.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To flame dried flask containing (E)-4-oxo-2-pentenoyl chloride (1.16 g, 8.76 mmol) in ether cooled to -15° C. is added diethylamine (1.41 g, 19.28 mmol) in ether (5 ml) and stirred for 2 hours while being warmed to ambient temperature. The solvents are removed in vacuo, and chromatographed on silica gel (230-400 mesh, 100 ml), eluting with hexane/ethyl acetate (75/25). The appropriate fractions are combined (Rf =0.31, TLC, hexane/ethyl acetate, 25/75) and concentrated in vacuo to give the title compound, NMR (CDCl3) 7.15, 7.04, 3.45, 3.40, 2.33, 1.20, 1.15. To flame dried flask while being warmed to ambient temperature The solvents are removed in vacuo chromatographed on silica gel (230-400 mesh, 100 ml) eluting with hexane/ethyl acetate (75/25) concentrated in vacuo