Abstract: Disclosed are certain novel substituted 4(3H)-oxobenzo-2,1,3-thiadiazine-2,2-dioxide compounds and derivatives thereof and methods employing the same in the control of undesired vegetation.

Abstract: Apparatus for quantitatively determining the presence of chloromethyl methyl ether and/or bis-chloromethyl ether in a fluid.The above compounds are reacted in the apparatus of the invention with a reactant from the group consisting of an alkali metal salt of a lower alcohol, an alkali metal salt of phenol or an alkyl phenol, an alkali metal salt of a chlorophenol or a bromophenol, an alkali metal salt of an alkoxy phenol, an alkali metal salt of a chlorinated pyridinol, and an alkali metal salt of thiophenol, dissolved in a lower alcohol, to form derivatives which provide suitable stability, specificity and sensitivity, and then applied to a gas chromatograph utilizing a suitable detector coupled to a readout device. The apparatus is automated and controlled by timing means.

Abstract: Disclosed herein are substituted oxirane compounds corresponding to the formula ##SPC1##Wherein X represents halogen; Z represents hydrogen, halogen, cyano or lower alkyl; R and R' each independently represent hydrogen, halogen, cyano, nitro, alkoxy, trifluoromethyl, benzyloxy or lower alkyl, with the proviso that when R' is hydrogen, R is other than hydrogen. The compounds are especially useful as pesticides in preventing germination of undesired plant seeds and controlling noxious weeds and fungal organisms and can be formulated to provide pesticidal compositions.