(E)-1-diethoxyphosphorylprop-1-ene

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

Procedure: To a solution of diethyl trans-1-propenylphosphonate (32.04 g.) in carbon tetrachloride (320 ml.) were added N-bromosuccinimide (41.65 g.) and dibenzoylperoxide (2.8 g.). The reaction mixture was heated to reflux for 1.5 hours and stirred for 30 minutes under ice-cooling. Insoluble materials were removed off by filtration and the filtrate was concentrated under reduced pressure to give an oily residue (63.09 g.), which was subjected to a column chromatography on silicagel and eluted with chloroform. The eluates were evaporated to dryness under reduced pressure to give an oily diethyl 3-bromo-trans-1-propenylphosphonate (27.04 g.). The reaction mixture was heated to reflux for 1.5 hours cooling Insoluble materials were removed off by filtration the filtrate was concentrated under reduced pressure to give an oily residue (63.09 g.), which eluted with chloroform The eluates were evaporated to dryness under reduced pressure

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

Procedure: To a solution of diethyl trans-1-propenylphosphonate (32.04 g.) in carbon tetrachloride (320 ml.) were added N-bromosuccinimide (41.65 g.) and dibenzoylperoxide (2.8 g.). The reaction mixture was heated to reflux for 1.5 hours and stirred for 30 minutes under ice-cooling. Insoluble materials were removed off by filtration and the filtrate was concentrated under reduced pressure to give an oily residue (63.09 g.), which was subjected to a column chromatography on silicagel and eluted with chloroform. The eluates were evaporated to dryness under reduced pressure to give an oily diethyl 3-bromo-trans-1-propenylphosphonate (27.04 g.). The reaction mixture was heated to reflux for 1.5 hours cooling Insoluble materials were removed off by filtration the filtrate was concentrated under reduced pressure to give an oily residue (63.09 g.), which eluted with chloroform The eluates were evaporated to dryness under reduced pressure