Substituted dioxolan and dioxan derivatives

Abstract From the Canadian patent

5-16287/1+2, Substituted dioxolan and dioxan derivatives Abstract, Novel substituted 1,3-dloxolan and 1,4-dioxnn derivatives of formula I, (I), in which, Rl, R2, R3, R4 Rs and R6 each independently of the others represents hydrogen or C1-C4-alkyl or, if n=1 R2 and R4 together represent one of the radicals (CH2)3 or (CH2)4;, R7 represent hydrogen, halogen methyl, ethyl, Cl-C2-alkyl sub-, stltuted by 1 to 5 halogen atoms methoxy, ethoxy or C1-Cz-, alkoxy substituted by 1 to 5 halogen atoms; R8 represents halogen, C1-C3-alkyl, Cl-C3-alkyl substituted by 1 to 7 halogsn atoms, C1 C3-alkoxy, Cl-C3-alkoxy substituted by 1 to 7 halogen atoms, or cyano, U represents a grouping -CH- or -N-; X …