Synthesis and synthetic applications of selenium counterparts of amides, ie, selenoamides, have been widely developed in recent years. 1, 2 On the contrary, little is known about their structures. There has been several reports on the X-ray molecular structure analyses of only tertiary selenoamides3-5 and selenoformamides. 6 No structural studies have been reported on secondary selenoamides except for one case7 despite their potential importance ...