1-benzoyl-3-chloroazepan-2-one

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

Procedure: The ODCB solution of N-benzoyl-α-chloro-ε-caprolactam is passed through a charcoal bed to remove tars as impurities. It is then passed into another reaction vessel where 9718 parts (86 mols) of ε-caprolactam are added. The transamidation is conducted by heating and stirring the ODCB solution at 140° C. for 2 hours. The solution is then cooled to 5° C. for 1 hour whereupon 21,000 parts (82 mols) N-benzoyl-α-chloro-ε-caprolactam precipitates out of the solution. The N-benzoyl-α-chloro-ε-caprolactam is filtered off and saved for recycle. The ODCB solution is then extracted with 250,000 parts 8 weight percent aqueous hydrochloric acid to remove α-chloro-ε-caprolactam and residual ε-caprolactam. The aqueous hydrochloric acid is then extracted countercurrently with 250,000 parts chloroform, and the chloroform extract evaporated to yield 10,915 parts (74 mols) of α-chloro-ε-caprolactam and 1356 parts (12 mols) of ε-caprolactam. The ε-caprolactam is separated from the α-chloro-ε-caprolactam by fractional distillation under vacuum and recycled to the transamidation step. to remove tars as impurities It is then passed into another reaction vessel by heating precipitates out of the solution The N-benzoyl-α-chloro-ε-caprolactam is filtered off The ODCB solution is then extracted with 250,000 parts 8 weight percent aqueous hydrochloric acid to remove α-chloro-ε-caprolactam and residual ε-caprolactam The aqueous hydrochloric acid is then extracted countercurrently with 250,000 parts chloroform the chloroform extract evaporated

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

Procedure: The ODCB solution of N-benzoyl-α-chloro-ε-caprolactam is passed through a charcoal bed to remove tars as impurities. It is then passed into another reaction vessel where 9718 parts (86 mols) of ε-caprolactam are added. The transamidation is conducted by heating and stirring the ODCB solution at 140° C. for 2 hours. The solution is then cooled to 5° C. for 1 hour whereupon 21,000 parts (82 mols) N-benzoyl-α-chloro-ε-caprolactam precipitates out of the solution. The N-benzoyl-α-chloro-ε-caprolactam is filtered off and saved for recycle. The ODCB solution is then extracted with 250,000 parts 8 weight percent aqueous hydrochloric acid to remove α-chloro-ε-caprolactam and residual ε-caprolactam. The aqueous hydrochloric acid is then extracted countercurrently with 250,000 parts chloroform, and the chloroform extract evaporated to yield 10,915 parts (74 mols) of α-chloro-ε-caprolactam and 1356 parts (12 mols) of ε-caprolactam. The ε-caprolactam is separated from the α-chloro-ε-caprolactam by fractional distillation under vacuum and recycled to the transamidation step. to remove tars as impurities It is then passed into another reaction vessel by heating precipitates out of the solution The N-benzoyl-α-chloro-ε-caprolactam is filtered off The ODCB solution is then extracted with 250,000 parts 8 weight percent aqueous hydrochloric acid to remove α-chloro-ε-caprolactam and residual ε-caprolactam The aqueous hydrochloric acid is then extracted countercurrently with 250,000 parts chloroform the chloroform extract evaporated

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

Procedure: The ODCB solution of N-benzoyl-α-chloro-ε-caprolactam is passed through a charcoal bed to remove tars as impurities. It is then passed into another reaction vessel where 9718 parts (86 mols) of ε-caprolactam are added. The transamidation is conducted by heating and stirring the ODCB solution at 140° C. for 2 hours. The solution is then cooled to 5° C. for 1 hour whereupon 21,000 parts (82 mols) N-benzoyl-α-chloro-ε-caprolactam precipitates out of the solution. The N-benzoyl-α-chloro-ε-caprolactam is filtered off and saved for recycle. The ODCB solution is then extracted with 250,000 parts 8 weight percent aqueous hydrochloric acid to remove α-chloro-ε-caprolactam and residual ε-caprolactam. The aqueous hydrochloric acid is then extracted countercurrently with 250,000 parts chloroform, and the chloroform extract evaporated to yield 10,915 parts (74 mols) of α-chloro-ε-caprolactam and 1356 parts (12 mols) of ε-caprolactam. The ε-caprolactam is separated from the α-chloro-ε-caprolactam by fractional distillation under vacuum and recycled to the transamidation step. to remove tars as impurities It is then passed into another reaction vessel by heating precipitates out of the solution The N-benzoyl-α-chloro-ε-caprolactam is filtered off The ODCB solution is then extracted with 250,000 parts 8 weight percent aqueous hydrochloric acid to remove α-chloro-ε-caprolactam and residual ε-caprolactam The aqueous hydrochloric acid is then extracted countercurrently with 250,000 parts chloroform the chloroform extract evaporated