2,2,2-trifluoro-N'-(2,2,2-trifluoroacetyl)acetohydrazide

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

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

Procedure: A mixture of N,N-diethylaniline hydrochloride (18.5 g, 0.1 mol), 1,2-bis(trifluoroacetyl)hydrazine (10.3 g, 0.46 mol) and phosphoryl chloride (160 mL) was stirred for 30 minutes under nitrogen in a flask fitted with a condenser leading to a cold trap (−78° C.). The mixture was heated under reflux for 5 h and then allowed to cool and stored overnight. The flask contents and the small amount of material which had condensed in the cold trap were combined and the two layers which had formed were separated. The layer was added to ice water (85 mL) and the mixture vigorously stirred for 1 h in a flask fitted with a condenser. Separation of the lower organic layer gave the main batch of the crude product (6.4 g). The original dark upper layer was treated similarly with ice water (75 mL) and the organic layer subjected to preliminary purification by trap-to-trap distillation in vacuum to afford a second batch of crude product (1.6 g). Distillation of the combined product through a vacuum-jacketed Vigreux column gave 2,5-dichloro-1,1,1,6,6,6-hexafluoro-3,4-diazahexa-2,4-diene (6.3 g, 53%) as an oil. fitted with a condenser leading to a cold trap (−78° C.) The mixture was heated under reflux for 5 h to cool stored overnight condensed in the cold trap the two layers which had formed were separated The layer was added to ice water (85 mL) the mixture vigorously stirred for 1 h in a flask fitted with a condenser Separation of the lower organic layer gave the main batch of the crude product (6.4 g) the organic layer subjected to preliminary purification by trap-to-trap distillation in vacuum to afford a second batch of crude product (1.6 g) Distillation of the combined product through a vacuum-jacketed Vigreux column

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

Procedure: Trifluoroacetic acid (7.6 mL, 0.1 mol) was added to a stirred solution of trifluoroacethydrazide (12.8 g, 0.1 mol) in benzene (100 mL) and the mixture was heated under reflux for 2 h. A Dean and Stark trap was fitted, and reflux was continued for 3 h. Reflux was continued in the absence of the Dean and Stark trap (3 h) and then with the trap refitted (20 h). The resulting white solid was collected by filtration, dried in vacuum and identified as 1,2-bis(trifluoroacetyl)hydrazine (16.5 g, 73%). M.p. 173-175° C. the mixture was heated under reflux for 2 h A Dean and Stark trap was fitted reflux Reflux was continued in the absence of the Dean and Stark trap (3 h) (20 h) The resulting white solid was collected by filtration dried in vacuum

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

Procedure: Trifluoroacetic acid (7.6 mL, 0.1 mol) was added to a stirred solution of trifluoroacethydrazide (12.8 g, 0.1 mol) in benzene (100 mL) and the mixture was heated under reflux for 2 h. A Dean and Stark trap was fitted, and reflux was continued for 3 h. Reflux was continued in the absence of the Dean and Stark trap (3 h) and then with the trap refitted (20 h). The resulting white solid was collected by filtration, dried in vacuum and identified as 1,2-bis(trifluoroacetyl)hydrazine (16.5 g, 73%). M.p. 173-175° C. the mixture was heated under reflux for 2 h A Dean and Stark trap was fitted reflux Reflux was continued in the absence of the Dean and Stark trap (3 h) (20 h) The resulting white solid was collected by filtration dried in vacuum

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

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

Procedure: A mixture of N,N-diethylaniline hydrochloride (18.5 g, 0.1 mol), 1,2-bis(trifluoroacetyl)hydrazine (10.3 g, 0.46 mol) and phosphoryl chloride (160 mL) was stirred for 30 minutes under nitrogen in a flask fitted with a condenser leading to a cold trap (−78° C.). The mixture was heated under reflux for 5 h and then allowed to cool and stored overnight. The flask contents and the small amount of material which had condensed in the cold trap were combined and the two layers which had formed were separated. The layer was added to ice water (85 mL) and the mixture vigorously stirred for 1 h in a flask fitted with a condenser. Separation of the lower organic layer gave the main batch of the crude product (6.4 g). The original dark upper layer was treated similarly with ice water (75 mL) and the organic layer subjected to preliminary purification by trap-to-trap distillation in vacuum to afford a second batch of crude product (1.6 g). Distillation of the combined product through a vacuum-jacketed Vigreux column gave 2,5-dichloro-1,1,1,6,6,6-hexafluoro-3,4-diazahexa-2,4-diene (6.3 g, 53%) as an oil. fitted with a condenser leading to a cold trap (−78° C.) The mixture was heated under reflux for 5 h to cool stored overnight condensed in the cold trap the two layers which had formed were separated The layer was added to ice water (85 mL) the mixture vigorously stirred for 1 h in a flask fitted with a condenser Separation of the lower organic layer gave the main batch of the crude product (6.4 g) the organic layer subjected to preliminary purification by trap-to-trap distillation in vacuum to afford a second batch of crude product (1.6 g) Distillation of the combined product through a vacuum-jacketed Vigreux column

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

Procedure: Trifluoroacetic acid (7.6 mL, 0.1 mol) was added to a stirred solution of trifluoroacethydrazide (12.8 g, 0.1 mol) in benzene (100 mL) and the mixture was heated under reflux for 2 h. A Dean and Stark trap was fitted, and reflux was continued for 3 h. Reflux was continued in the absence of the Dean and Stark trap (3 h) and then with the trap refitted (20 h). The resulting white solid was collected by filtration, dried in vacuum and identified as 1,2-bis(trifluoroacetyl)hydrazine (16.5 g, 73%). M.p. 173-175° C. the mixture was heated under reflux for 2 h A Dean and Stark trap was fitted reflux Reflux was continued in the absence of the Dean and Stark trap (3 h) (20 h) The resulting white solid was collected by filtration dried in vacuum

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

Procedure: A mixture of N,N-diethylaniline hydrochloride (18.5 g, 0.1 mol), 1,2-bis(trifluoroacetyl)hydrazine (10.3 g, 0.46 mol) and phosphoryl chloride (160 mL) was stirred for 30 minutes under nitrogen in a flask fitted with a condenser leading to a cold trap (−78° C.). The mixture was heated under reflux for 5 h and then allowed to cool and stored overnight. The flask contents and the small amount of material which had condensed in the cold trap were combined and the two layers which had formed were separated. The layer was added to ice water (85 mL) and the mixture vigorously stirred for 1 h in a flask fitted with a condenser. Separation of the lower organic layer gave the main batch of the crude product (6.4 g). The original dark upper layer was treated similarly with ice water (75 mL) and the organic layer subjected to preliminary purification by trap-to-trap distillation in vacuum to afford a second batch of crude product (1.6 g). Distillation of the combined product through a vacuum-jacketed Vigreux column gave 2,5-dichloro-1,1,1,6,6,6-hexafluoro-3,4-diazahexa-2,4-diene (6.3 g, 53%) as an oil. fitted with a condenser leading to a cold trap (−78° C.) The mixture was heated under reflux for 5 h to cool stored overnight condensed in the cold trap the two layers which had formed were separated The layer was added to ice water (85 mL) the mixture vigorously stirred for 1 h in a flask fitted with a condenser Separation of the lower organic layer gave the main batch of the crude product (6.4 g) the organic layer subjected to preliminary purification by trap-to-trap distillation in vacuum to afford a second batch of crude product (1.6 g) Distillation of the combined product through a vacuum-jacketed Vigreux column

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

Procedure: Trifluoroacetic acid (7.6 mL, 0.1 mol) was added to a stirred solution of trifluoroacethydrazide (12.8 g, 0.1 mol) in benzene (100 mL) and the mixture was heated under reflux for 2 h. A Dean and Stark trap was fitted, and reflux was continued for 3 h. Reflux was continued in the absence of the Dean and Stark trap (3 h) and then with the trap refitted (20 h). The resulting white solid was collected by filtration, dried in vacuum and identified as 1,2-bis(trifluoroacetyl)hydrazine (16.5 g, 73%). M.p. 173-175° C. the mixture was heated under reflux for 2 h A Dean and Stark trap was fitted reflux Reflux was continued in the absence of the Dean and Stark trap (3 h) (20 h) The resulting white solid was collected by filtration dried in vacuum