Abstract: A class of 5-ureido and thioureido-1,3,4-thiadiazole-2-sulfonamides bearing various substituents on both sulfonamide and ureido nitrogen atoms is employed to combat unwanted vegetation both pre- and post-emergently.

Abstract: A class of 3-benzyl-2-methylimino-5-phenyl-.DELTA..sup.4 -1,3,4-thiadiazolines which may have certain specific substituents on the benzyl and phenyl rings are useful in combating various weeds in grain crops, for example, grassy weeds in wheat and rice fields.

Abstract: In the process for manufacturing 4-chloro-2-butynyl m-chlorocarbanilate (the herbicide barban) from the corresponding 4-hydroxy-2-butynyl m-chlorocarbanilate it has been discovered that yields and product quality are improved by employing dimethylformamide as reaction promoter in combination with thionyl chloride or phosgene as chlorinating agent.

Abstract: 3,5-ditert.butyl-4-hydroxybenzaldehyde is manufactured in good yields by reacting 2,6-ditert.-butylphenol with hexamethylenetetramine or a combination of formaldehyde and ammonium acetate in aqueous acetic acid reaction medium.

Abstract: Certain noxious weeds, particularly yellow foxtail (Setaria glanca) and beggarweed (Desmodium torguosum) are combated in a number of crops by preemergent application of a synergistic combination of preferably about two parts by weight of N-benzyl-N-isopropylpivalamide with one part by weight of 2-cyclopropanecarboxamide-5-(2-chloro-1,1-dimethylethyl)-1,3,4-thiadiazole . Synergistic interaction of the two compounds is graphically illustrated by isobole charts of application rates which produce severe injury to specific weeds.

Abstract: 3,5-ditert.butyl-4-hydroxybenzyl alcohol is converted to the corresponding aldehydes by reaction with hexamethylenetetramine in aqueous acetic acid medium.

Abstract: Undesired vegetation such as crabgrass, downey brome, giant foxtail, yellow foxtail, barnyard grass, flax and wild oats are combated by pre-emergent application of at least one compound belonging to a class of substituted N-benzyl amides of alkanoic and benzoic acids, particularly in the presence of seeds of such crops as cotton and soybeans.

Abstract: Triazolylsulfonamides of a limited class are substantially non-phytotoxic and are useful as insecticides. For example 1-N,N-dimethylcarbamyl-3-tert.butyl-1,2,4-triazol-5-yl-N,N-dimethylsulfona mide is effective in aphid control, both by foliar application and systemically.

Abstract: Unwanted vegetation is combated in the presence of grain crops and soybeans by post-emergent application of one or more of the following compounds:2-(m-chlorophenyl)-4H-3,1-benzoxazin-4-one,2-(m-trifluoromethylphenyl)-4H-3,1-benzoxazin-4-one,2-(2-thienyl)-4H-3,1-benzoxazin-4-one,2-(o-trifluoromethylphenyl)-4H-3,1-benzoxazin-4-one,2-(p-trifluoromethylphenyl)-4H-3,1-benzoxazin-4-one,2-(4-methyl-1,2,3-thiadizole-5-yl)-benzoxazin-4-one2-(m-bromophenyl)-4H-3,1-benzoxazin-4-one.

Abstract: Non-cap sensitive aqueous gel explosives containing no suspended solid fuels are made by combining water, hexamethylenetetramine, ammonium nitrate, sodium nitrate, ammonium perchlorate and nitric acid, along with sufficient polysaccharide gum to thicken the mixture. These explosives are rendered cap sensitive by mixing therewith paint grade aluminum powder or other conventional sensitizing agents. According to a preferred procedure, a cap sensitive aqueous gel explosive is made by a procedure in which nitric acid and aqueous hexamethylenetetramine solution are first combined under controlled conditions of temperature and pH and ammonium nitrate, sodium nitrate, ammonium perchlorate, thickening agent and aluminum powder are added in controlled amounts in a specified order. The products possess cap sensitivity, even at temperatures as low as minus 23.degree.C.