| abstract |
Cpds. of gen. formula (I): (where R = polyhaloalkyl; R1 and R2 = H, hal., hal, NO2, CF3, lower alkyl, alkoxy, alkylthio or alkylsulphonyl; R3 = C6H4R4; R4 = H, hal., lower alkyl- or alkoxy, cycloalkyl, pyridyl, furyl or thienyl; W = -O or -S) are prepd. by reacting a cpd. (II) with R-OH; or by reaction of a cpd. (III) where X = -O or imino; with a cpd. with an OCN- or SCN- group in the molecule or, when X = imino, by reaction of (III) with a cpd. (Y) YZ-C=W where Y and Z=Cl, benzyloxy, CCl3, imidazolyl-1, lower alkoxy or alkylthio. |