2,2-dichloroacetaldehyde

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: Tosylhydrazine (234 g, 1.26 mol) was suspended in propionic acid (2 L) and dichloroacetaldehyde (142 g, 1.26 mol) was added at 15-20° C. The mixture was stirred at room temperature for 2 hours and under ice-cooling for 3 hours. The precipitated crystals were collected by filtration and washed with toluene. The crystals were dried under reduced pressure to give 2,2-dichloroacetaldehyde tosylhydrazone (247 g, yield 70%). cooling for 3 hours The precipitated crystals were collected by filtration washed with toluene The crystals were dried under reduced pressure

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

Procedure: Tosylhydrazine (234 g, 1.26 mol) was suspended in propionic acid (2 L) and dichloroacetaldehyde (142 g, 1.26 mol) was added at 15-20° C. The mixture was stirred at room temperature for 2 hours and under ice-cooling for 3 hours. The precipitated crystals were collected by filtration and washed with toluene. The crystals were dried under reduced pressure to give 2,2-dichloroacetaldehyde tosylhydrazone (247 g, yield 70%). cooling for 3 hours The precipitated crystals were collected by filtration washed with toluene The crystals were dried under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: Tosylhydrazine (234 g, 1.26 mol) was suspended in propionic acid (2 L) and dichloroacetaldehyde (142 g, 1.26 mol) was added at 15-20° C. The mixture was stirred at room temperature for 2 hours and under ice-cooling for 3 hours. The precipitated crystals were collected by filtration and washed with toluene. The crystals were dried under reduced pressure to give 2,2-dichloroacetaldehyde tosylhydrazone (247 g, yield 70%). cooling for 3 hours The precipitated crystals were collected by filtration washed with toluene The crystals were dried under reduced pressure