Abstract: Certain novel carbamates and thiolcarbamates are broad spectrum herbicides, which can be applied to the locus of undesired vegetation either preemergence or postemergence. Typical representatives of this class of compounds are methyl N-(N-cyclohexylcarbamoyl-N',N'-dimethylamidino)-N-methylcarbamate and methyl N-?1-(3-cyclohexyl-1-methylureido)-1-dimethylaminomethylene!carbamate.

Abstract: An improved process for converting N-hydroxythioimidates to N-(methylcarbamoyloxy)-thioimidates by reaction with methylcarbamoyl chloride at pH above 10 in a two-phase reaction medium: water and a water-immiscible organic solvent.

Abstract: Process for making methyl isocyanate comprising thermally dehydrochlorinating a solution of methyl carbamyl chloride in an aprotic nonpolar solvent, condensing the gases thereby formed at a temperature above the boiling point of methyl isocyanate so as to liquify at least part of said gases which are condensable at said temperature, removing HCl gas by condensing the remaining condensable gases at a temperature below the boiling point of methyl isocyanate, and separating methyl isocyanate from the condensate obtained in said first condensation step.

Abstract: Certain novel carbamates of the formulas: ##STR1## where R.sub.1 is alkyl of 1-3 carbon atoms;R.sub.2 is alkyl of 1-4 carbon atoms; andX.sub.1 and X.sub.2 are independently selected from oxygen and sulfur; ARE USEFUL INTERMEDIATES TO REACT WITH AROMATIC AND ALIPHATIC AMINES TO YIELD HERBICIDAL ALLOPHANIMIDATES.

Abstract: Certain novel carbamates of the formulas: ##STR1## where R.sub.1 is alkyl of 1-3 carbon atoms;R.sub.2 is alkyl of 1-4 carbon atoms; andX.sub.1 and X.sub.2 are independently selected from oxygen and sulfur;Are useful intermediates to react with aromatic and aliphatic amines to yield herbicidal allophanimidates.

Abstract: Herbicidal allophanimidic acid esters of the formula: ##STR1## where R.sub.1, R.sub.2, R.sub.4 and R.sub.5 are selected from hydrogen and certain organic radicals, at least one of them being an organic radical;R.sub.3 is selected from hydrogen and certain organic radicals;R.sub.6 is selected from certain organic radicals; andX.sub.1, x.sub.2, and X.sub.3 are selected from oxygen and sulfur;And salts of the above compounds in which R.sub.3 is hydrogen.Preparation of the compounds by carbamoylation of ##STR2## or by reaction of ammonia or an amine with ##STR3## where Y is --SCH.sub.3, --Cl, or ##STR4## An exemplary compound: methyl N-dimethylcarbamoyl-4-tert-butylthioallophanimidate.

Abstract: Certain novel carbamates and thiolcarbamates are broad spectrum herbicides, which can be applied to the locus of undesired vegetation either preemergence or postemergence. Typical representatives of this class of compounds are methyl N-(N-cyclohexylcarbamoyl-N',N'-dimethylamidino)-N-methylcarbamate and methyl N-[1-(3-cyclohexyl-1-methylureido)-1-dimethylaminomethylene]carbamate.

Abstract: Continuous or semi-continuous process for preparing acetohydroxamyl chloride. Acetaldoxime and chlorine are introduced simultaneously into an aqueous reaction medium. The reaction is conducted at an acetaldoxime concentration below 1%.

Abstract: 1,3,5-Triazinediones of the formula ##SPC1##Wherein X.sub.1, X.sub. 2, R.sub.1, R.sub. 2 and R.sub.3 are as hereinafter defined, are useful for the selective control of weeds in crops, e.g., corn. Many are also useful for altering plant flowering and plant sexual reproduction.Exemplary of the class of compounds are 3-isopropyl-6-methylthio-s-triazine-2,4(1H,3H)-dione, 3-(p-chlorophenyl)-6-methoxy-s-triazine-2,4(1H,3H)-dione.

Abstract: 1,3,5-Triazinediones of the formula ##SPC1##Wherein X.sub.1, X.sub.2, R.sub.1, R.sub.2 and R.sub.3 are as hereinafter defined, are useful for the selective control of weeds in crops, e.g., corn. Many are also useful for altering plant flowering and plant sexual reproduction.Exemplary of the class of compounds are 3-isopropyl-6-methylthio-s-triazine-2,4(1H,3H)-dione, 3-(p-chlorophenyl)-6-methoxy-s-triazine-2,4(1H,3H)-dione.

Abstract: Certain novel carbamates and thiolcarbamates are broad spectrum herbicides, which can be applied to the locus of undesired vegetation either preemergence or postemergence. Typical representatives of this class of compounds are methyl N-(N-cyclohexylcarbamoyl-N',N'-dimethylamidino)-N-methylcarbamate and methyl N-[1-(3-cyclohexyl-1-methylureido)-1-dimethylaminomethylene]carbamate.