Patent number: 5391762
Abstract: The compounds of the formula I ##STR1## in which Y and Y.sub.1 are each, independently of one another, O, S, NH or N-alkyl, N-cycloalkyl, N-phenyl or N-benzyl, or Y and Y.sub.1 are together N-alkylene-N,R and R.sub.1 are each, independently of one another, H, alkyl, cycloalkyl, aralkyl or aryl,R.sub.2 and R.sub.3 are each, independently of one another, H, or R.sub.2 forms, together with R.sub.6 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.3 is H, or R.sub.3 forms, together with R.sub.7 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.2 is H,R.sub.4 and R.sub.5 are each, independently of one another, H, R.sub.4 forms, together with R.sub.8 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.5 is H, or R.sub.5 forms, together with R.sub.9 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.4 is H,R.sub.6, R.sub.7, R.sub.8 and R.sub.9 are each, independently of one another, H, alkyl, cycloalkyl, aralkyl or aryl, or R.sub.6 and R.
Type:
Grant
Filed:
September 14, 1993
Date of Patent:
February 21, 1995
Assignee:
Ciba-Geigy Corporation
Inventors:
Rudolf Naef, Beat Schmidhalter, Hanspeter Preiswerk