Abstract: The present invention relates to the preparation of alkyl-ureas, starting from O,S-dimethyl dithiocarbonate, which provides the following steps: A) causing the O,S-dimethyl dithiocarbonate to react with a primary amine of general formula R1NH2 in order to obtain an O-methyl thiocarbamate; B) isomerising the O-methyl thiocarbamate in order to obtain an S-methyl thiocarbamate; C) causing the S-methyl thiocarbamate with a compound of general formula R′R″NH, wherein R′ and R″ may be equal or different one in respect of the other and of R1 and may be H, R2 or R3, in order to obtain one of the alkyl-ureas of formula (4), (5) or (6).

Abstract: A process to prepare alkansulphonamides of formula RSO.sub.2 NR.sup.1 R.sub.2 --wherein R is an alkyl group containing from 1 to 15 carbon atoms, or an alkyl group containing from 1 to 15 carbon atoms substituted by one or more chlorine or bromine atoms, and R.sup.1 and R.sup.2 are equal or different and may be hydrogen or an alkyl group containing from 1 to 15 carbon atoms--provides to treat an alkansulphonylhalide of formula RSO.sub.2 X--wherein X is chlorine, bromine or iodine--with a suitable quantity of a compound of formula NHR.sup.1 R.sup.2, using as solvent for said treatment an aliphatic nitrile.

Abstract: Compounds of formula: ##STR1## where R is alkyl having from 1 to 8 carbon atoms, alkenyl having from 3 to 8 carbon atoms or cyclohexyl;R.sub.1 is alkyl having from 1 to 8 carbon atoms, alkenyl having from 3 to 8 carbon atoms or cyclohexyl; andR and R.sub.1 together can form a --(CH.sub.2)--.sub.n group wherein n is an integer from 4 to 6. These compounds can be used as phytotoxicity antidotes for thiolcarbamate and/or acetanilide herbicides for use on corn cultivations.

Abstract: To obtain technical TRIFLURALIN with a nitrosoamine content not exceeding 1 ppm, for use as a herbicide, 1-chloro-2,6-dinitro-4-(trifluoromethyl) benzene (DINITRO-PCBT) is freed from nitrosating agents by a process in which DINITRO-PCBT is treated with an aqueous bisulphite solution having an SO.sub.2 concentration of between 1% and 5% at a pH of between 1 and 3, at a temperature of between 50.degree. and 100.degree. C. for a time of between 1 and 3 hours. The organic layer is then separated from the aqueous layer, and the acidity and last traces of the bisulphite solution are eliminated from the organic layer by means of an aqueous alkaline solution.

Abstract: In order to synthesize N-isopropyl-N'-o-carbomethoxyphenylsulphamide, sulphuric chlorohydrin is reacted with a pyridic base between -10.degree. and 50.degree. C., after which anthranilic acid methyl ester is firstly added at 0.degree.-60.degree. C., followed by isopropylamine at 0.degree.-60.degree. C., and finally phosphoric anhydride at 20.degree.-80.degree. C., the product being precipitated by dilution with water and recovered by filtration.

Abstract: A process for producing tricyclohexyl tin derivatives, consists of a first phase in which Grignard reagent and tin tetrahalogenide are caused to react by feeding them into a reaction vessel in a molar ratio of 3:1, and a second phase in which after hydrolysis and anhydridization of the condensation mass, further Grignard reagent is added in an amount such as to maintain the total molar ratio, between the Grignard reagent and the tin tetrahalogenide, between 3.5:1 and 3.9:1.

Abstract: Substituted thiocarbamates are produced by continuously feeding together a secondary amine and sulphur in stoichiometric proportions and in a suitable solvent into a reaction column subjected to pressure by carbon monoxide. A continuous circulation of the reaction solution is maintained in the column, and the effluent is subjected to alkylation, the substituted carbamate being derived therefrom continuously.

Abstract: The compound 5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone free from 5-chloro-4-amino-2-phenyl-3(2H)-pyridazinone is used as selective weed-killer in a remarkably more efficacious and remarkably less phytotoxical way than the presently known "pyrazon" (mixture of 5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone and 5-chloro-4-amino-2-phenyl-3(2H)-pyridazinone). The 5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone is obtained from pyrazon by treating said pyrazon with a mineral acid of pre-fixed concentration, obtaining a suspension and filtering such a suspension. The use thereof as weed-killer is carried out in suitable formulations.

Abstract: A new heterocyclic chemical compound useful in the field of agricultural applications and in that of coloring substances has the formula ##STR1## (6-phenyl-[1,2,3]-oxadiazolo-(4,5 d)-pyridazine-7(6H)-one).

Abstract: In a process for obtaining 4,5-dichloro-2-phenyl-3(2H)-pyridazinone from 5-chloro-4-amino-2-phenyl-3(2H)-pyridazinone the 5-chloro-4-amino-2-phenyl-3(2H)-pyridazinone is diazotized in a first stage in accordance with the following reaction: ##STR1## the compound (I) being obtained by dilution with water and filtration. In a second stage of the process the compound (I) is reacted with thionyl chloride in accordance with the following reaction: ##STR2## the 4,5-dichloro-2-phenyl-3(2H)-pyridazinone being obtained by dilution with water and filtration.

Abstract: Process and apparatus for the production, in a continuous cycle, of cyclohexyl magnesium halides according to which cyclohexyl halide is fed from the bottom, at a constant rate, into a thermostatized column containing magnesium shavings fed from the top of the column itself, and the desired cyclohexyl magnesium halide is recovered in the top part of the column, the temperature of the column being kept at about 58.degree.-60.degree. C. and the cyclohexyl halide being fed in a solution of tetrahydrofuran.