New chemistry from the reaction of N,N'-disubstituted ethylenediamines with glyoxal: synthesis of 2-imidazolidinecarboxaldehydes and 1,4,6,9-tetraalkyl-1,4,6,9-tetraaza-5,10-dioxaperhydroanthracenes
New chemistry from the reaction of N,N'-disubstituted ethylenediamines with glyoxal: synthesis of 2-imidazolidinecarboxaldehydes and 1,4,6,9-tetraalkyl-1,4,6,9-tetraaza-5,10-dioxaperhydroanthracenes