Lepidoptericidal and herbicidal active compounds having the generic formula ##STR1## wherein R, R.sup.1, R.sup.2 and R.sup.3 are as disclosed herein. In general, these compounds show enhanced lepidoptericidal activity and show reduced phytotoxic effect on crops to be protected from the lepidoptera.
New thioethers of the formula ##STR1## in which Ac represents an acyl radical have been found. They are useful for producing silver halide emulsions for photographic materials.