In organic chemistry, an aldimine is an imine that is an analog of an aldehyde.As such, aldimines have the general formula R–CH=N–R'. Aldimines are similar to ketimines, which are analogs of ketones.Primary aldimineSecondary aldimineAldehyde In organic chemistry, an aldimine is an imine that is an analog of an aldehyde.As such, aldimines have the general formula R–CH=N–R'. Aldimines are similar to ketimines, which are analogs of ketones. An important subset of aldimines are the Schiff bases, in which the substituent on the nitrogen atom (R') is an alkyl or aryl group (i.e. not a hydrogen atom). Aldimines may be named in three different manners: