公开(公告)号：DK121862B

公开(公告)日：1971-12-13

申请号：DK393264

申请日：1964-08-08

Applicant: EDISON SPA

Inventor： RIBALDONE G ,  SMAI F ,  BORSOTTI G

IPC: C07D201/10 ,  C07D41/06

公开(公告)号：NO115739B

公开(公告)日：1968-11-25

申请号：NO15432864

申请日：1964-08-08

Applicant: EDISON SPA

Inventor： RIBALDONE G ,  SMAI F ,  BORSOTTI G

IPC: C07D201/10

公开(公告)号：SE316169B

公开(公告)日：1969-10-20

申请号：SE422264

申请日：1964-04-06

Applicant: EDISON SPA

Inventor： NENZ A ,  BRICHTA C ,  RIBALDONE G

IPC: C07C45/46 ,  C07C49/792 ,  C07C49/00

公开(公告)号：SE302606B

公开(公告)日：1968-07-29

申请号：SE879063

申请日：1963-08-12

Applicant: EDISON SPA

Inventor： BRICHTA C ,  BORSOTTI G ,  GALLINELLA E ,  NENZ A ,  RIBALDONE G

IPC: C07C131/00

公开(公告)号：DK111446B

公开(公告)日：1968-08-26

申请号：DK170463

申请日：1963-04-10

Applicant: EDISON SPA

Inventor： NENZ A ,  RIBALDONE G ,  BRICHTA C

IPC: C07C131/02

公开(公告)号：NO115580B

公开(公告)日：1968-10-28

申请号：NO15419864

申请日：1964-07-29

Applicant: EDISON SPA

Inventor： RIBALDONE G ,  BRICHTA C ,  NENZ A

IPC: C07D201/10

Abstract: Lactams are prepared by the reaction of a cycloalkanecarboxylic acid or an alkyl derivative thereof with nitrosyl hydrogen pyrosulphate. The reaction may be carried out in an inert solvent, e.g. in aliphatic, cycloaliphatic, chlorinated aliphatic hydrocarbon or nitroparaffin. The acid may be one having 4-12 carbon atoms in the ring. Examples are given for the preparation of caprolactam, capryllactam, valerolactam and lauryllactam. The process is operated at a temperature between 30 DEG and 150 DEG C. The lactam is separated by extracting the unreacted acid from the mixture by solvent extraction; neutralizing the remaining aqueous solution with an alkaline material, and extracting the lactam with a solvent, e.g. benzene, chloroform or methylene dichloride.