1-amino-1-phenylurea

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

Procedure: A suitable method for preparing the 2-phenylsemicarbazones comprises converting a 2-phenylsemicarbazone of one specific aldehyde into a 2-phenyl-semicarbazone of a different aldehyde by hydrolyzing the initially prepared 2-phenylsemicarbazone into the corresponding 2-phenylsemicarbazide which is then reacted with the desired aldehyde. For example, benzaldehyde 2-(3-chloro-4-fluorophenyl)-4,4-dimethylsemicarbazone prepared e.g., from benzaldehyde 3-chloro-4-fluorophenylhydrazone and dimethylcarbamoyl chloride is hydrolyzed to 2-(3-chloro-4-fluorophenyl)-4,4-dimethylsemicarbazide which is reacted with formaldehyde to give formaldehyde 2-(3-chloro-4-fluorophenyl)-4,4-dimethylsemicarbazone.

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

Procedure: A suitable method for preparing the 2-phenylsemicarbazones comprises converting a 2-phenylsemicarbazone of one specific aldehyde into a 2-phenyl-semicarbazone of a different aldehyde by hydrolyzing the initially prepared 2-phenylsemicarbazone into the corresponding 2-phenylsemicarbazide which is then reacted with the desired aldehyde. For example, benzaldehyde 2-(3-chloro-4-fluorophenyl)-4,4-dimethylsemicarbazone prepared e.g., from benzaldehyde 3-chloro-4-fluorophenylhydrazone and dimethylcarbamoyl chloride is hydrolyzed to 2-(3-chloro-4-fluorophenyl)-4,4-dimethylsemicarbazide which is reacted with formaldehyde to give formaldehyde 2-(3-chloro-4-fluorophenyl)-4,4-dimethylsemicarbazone.

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

Procedure: A suitable method for preparing the 2-phenylsemicarbazones comprises converting a 2-phenylsemicarbazone of one specific aldehyde into a 2-phenyl-semicarbazone of a different aldehyde by hydrolyzing the initially prepared 2-phenylsemicarbazone into the corresponding 2-phenylsemicarbazide which is then reacted with the desired aldehyde. For example, benzaldehyde 2-(3-chloro-4-fluorophenyl)-4,4-dimethylsemicarbazone prepared e.g., from benzaldehyde 3-chloro-4-fluorophenylhydrazone and dimethylcarbamoyl chloride is hydrolyzed to 2-(3-chloro-4-fluorophenyl)-4,4-dimethylsemicarbazide which is reacted with formaldehyde to give formaldehyde 2-(3-chloro-4-fluorophenyl)-4,4-dimethylsemicarbazone.