abstract |
Cyclic N,N'-dimethylurea cpds. of formula (I) in which n = 2 or 3, and prepd. by hydrogenation of cyclic urea cpds. of formula (II) or (III), where m=ocr1, n=2or3. In the presence of hydrogen and a hydrogenation catalyst comprising Pd on an inorganic carrier and additionally contg. S, Se and/or Te. |