Abstract: Provided a method for treating hardly-decomposable-substance-containing water, in which hardly decomposable substances such as dioxins, contained in contaminated water (treatment raw water) are concentrated and rendered harmless by providing the steps of (B) adding an adsorbent to water containing a hardly decomposable substance (treatment raw water) to cause the hardly decomposable substance to be adsorbed on the adsorbent (adsorption treatment step), (C) separating a permeated liquid through a filter membrane to concentrate the adsorbent adsorbing the hardly decomposable substance (membrane filtering treatment step), and (D) chemically decomposing the hardly decomposable substance adsorbed on the concentrated adsorbent with a peroxide without any operation of desorption from the adsorbent (chemical decomposition step), and the method can be applied to water containing a reducing substance such as bisulfate that neutralize free chlorine and can render the hardly decomposable substances harmless efficiently a

Abstract: Provided is a process for the production of 2-fluoroisobutyric acid or its ester, which comprises reacting 2-hydroxyisobutyric acid or its ester with thionyl chloride and a hydrogen fluoride source.

Abstract: A triazine compound of the formula ##STR1## wherein Y.sup.1 is a hydrogen atom or a methyl group and Z is an oxygen atom or a sulfur atom, X.sup.1 is a halogen atom and R is a hydrogen atom, a methyl group or an ethyl group. The triazine compound is useful as a herbicide for combatting weeds.

Abstract: The present invention relates to a novel triazine derivative represented by the general formula ##STR1## in the formula, A denotes ##STR2## (in which Y.sup.1 denotes a hydrogen atom or a methyl group and Z denotes an oxygen atom or a sulfur atom), ##STR3## (in which Y.sup.2 and Y.sup.3, which can be of the same kind or different kinds, each denote a methyl group or a methoxy group) or ##STR4## (in which Y.sup.4 denotes a methyl group, trifluoromethyl group, methoxy group or fluorine atom and n denotes an integer of 0 ro 2), X.sup.1 denotes a halogen atom and R.sup.1 denotes hydrogen, a methyl group or an ethyl group as well as a herbicide containing the triazine derivative represented by the general formula (I) as an effective ingredient.

Abstract: The present invention relates to a process for the production of a biguanide derivative useful as an intermediate for triazine-type herbicides, in which the biguanide derivative can be produced at high yields by reacting a phenoxyalkylamine salt with dicyandiamide in a solvent containing a paraffinic hydrocarbon having 8 to 15 carbon atoms, or by reacting a free phenoxylakylamine with a hydrogen halide in a solvent containing a paraffinic hydrocarbon having 8 to 15 carbon atoms and reacting the resultant a phenoxyalkylamine salt with dicyandiamide in the same solvent without isolating the phenoxyalkylamine salt.

Abstract: A process for producing a triazine derivative of the formula (III), ##STR1## wherein R.sup.1 is a C.sub.1 -C.sub.4 alkyl group, n is an integer of O to 2, R.sup.2 is hydrogen or a C.sub.1 -C.sub.2 alkyl group, and X is a halogen atom,which comprises reacting a biguanide derivative of the formula, ##STR2## wherein R.sup.1 and n are as defined in the formula (III), and X' is a halogen atom,with a halocarboxylic acid ester of the formula, ##STR3## wherein R.sup.2 and X are as defined in the formula (III), and R.sup.3 is a C.sub.1 -C.sub.4 alkyl group,in the presence of a base, wherein a dehydrating agent is present in the reaction system, and processes for producing 2-fluoroisobutyric acid ester as an intermediate compound for the production of the triazine derivative.

Abstract: A 2-fluoroisobutyric acid ester can be obtained at a high yield in one pot by reacting a 2-hydroxyisobutyric acid ester with fluorosulfuric acid in the absence or presence of a hydrogen fluoride source, or by reacting a 2-hydroxyisobutyric acid ester with chlorosulfuric acid in the presence of a hydrogen fluoride source.

Abstract: The triazine derivatives of the present invention are roughly classified into the compounds of the general formulas [I] and [II] and further classified into 4 types depending on the kind of the Z in the general formulas and the position of substitution of the aminoalkyl group on the benzo(thia)furanyl group. Furthermore, these triazine derivatives are useful as a herbicide or, in particular, as a herbicide for paddy rice plants with greater effectiveness and less injury by chemicals than known ones. In addition, they have a wide herbicidal spectrum and exhibit remarkable effects against various kinds of weeds.

Abstract: Novel triazine derivatives represented by the general formula (I): ##STR1## (wherein all the symbols are as defined in the appended claims), and herbicides containing the triazine derivatives of the general formula (I) as effective component. These triazine derivatives can exhibit their herbicidal activity against various types of weeds from annual weeds to perennial weeds while causing no injury against paddy rice plants. Thus the herbicides of the present invention have advantages in that the herbicidal effect is great, the chemical damage is low, and the weed-killing spectral width is broad.

Abstract: A triazine derivative represented by the general formula: ##STR1## or the general formula: ##STR2## (wherein X.sup.1 represents a hydrogen atom, a halogen atom an alkyl group having 1 to 4 carbon atoms or an alkoxyl group having 1 to 4 carbon atoms, Z represents an oxygen atom or a sulfur atom, R.sup.1 represents an alkyl group having 1 to 4 carbon atom, and R.sup.2 represents a halogen atom, an alkylthio group having 1 to 4 carbon atoms, or an alkoxyl group having 1 to 4 carbon atoms).This invention also provides a process for efficiently preparing said triazine derivative and a herbicide containing said triazine derivative as a herbicidally effective component.

Abstract: A triazine derivative represented by the general formula: ##STR1## wherein R.sup.1 and R.sup.2 are each an alkyl group having 1 to 4 carbon atoms, and X.sup.1 and X.sup.2 are each a halogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, or an alkylthio group having 1 to 4 carbon atoms.This invention also provides a process for efficiently preparing said triazine derivative and a herbicide containing said triazine derivative as effective component.