Abstract: A process for the preparation of a compound of formula (I) comprising oxidizing a compound of formula (II) with trifluoroperacetic acid in the presence of a corrosion inhibiting compound such as boric acid. Also, a process for preparing a compound of formula (II) by adding sulfur dioxide to a mixture of the corresponding disulfide, a formate salt, trifluoromethyl bromide and a polar solvent; and a process for preparing the disulfide comprising adding S2Cl2 to a solution, in an organic solvent, of the corresponding 4-unsubstituted pyrazole.

Abstract: A process for the preparation of a compound of formula (I) 1

Abstract: A process for the preparation of a compound of formula (I) comprising oxidizing a compound of formula (II) with trifluoroperacetic acid in the presence of a corrosion inhibiting compound such as boric acid. Also, a process for preparing a compound of formula (II) by adding sulfur dioxide to a mixture of the corresponding disulfide, a formate salt, trifluoromethyl bromide and a polar solvent; and a process for preparing the disulfide comprising adding S2Cl2 to a solution, in an organic solvent, of the corresponding 4-unsubstituted pyrazole.

Abstract: A process for preparing a compound of the formula ##STR1## wherein R is C.sub.1 -C.sub.18 alkyl by reacting a compound of the formulaRO.sub.2 C--CH.sub.2 CN (II)with a cyanide salt and formaldehyde or source thereof. Compounds of formula (I) are useful intermediates to pesticidally active compounds.

Abstract: A perfluoroalkylation reactant and a process for its use involving reactions with nucleophilic substrates. The perfluoroalkylation reactant comprises:a) a perfluoroalkanesulphinate; and,b) a monoelectronic oxidizing system whose redox potential is greater than or equal to 1.20 V relative to the so-called saturated calomel reference electrode (SCE: Hg/HgCl.sub.2).

Abstract: The present invention relates to a process for the preparation of perhaloalkylthioethers by bringing a perhaloalkyl halide, preferably a bromide or an iodide, into contact with a disulphide in the presence of zinc and of sulphur dioxide or of a dithionite or of a hydroxymethanesulphinate or of a formate anion and sulphur dioxide.

Abstract: The invention relates to an N-sulfomethylglycinate of formula:HO.sub.3 S--CH.sub.2 --NH--CH.sub.2 --COOR.sub.1 (I)COOR.sub.1 being a hydrolysable carboxylic ester group.It also relates to a process for the preparation of the compound of formula (I) consisting in putting in contact sulfur dioxide, formaldehyde, and glycine in the presence of a R.sub.1 OH alcohol, or glycinate.It also relates to the use of the compound of formula (I) for the preparation of herbicides of the glyphosate type of reaction with a phosphite or a phosphonate of formula (R.sub.2 O).sub.2 P (O) H in which (R.sub.2 O).sub.2 P is a hydrolysable phosphonic ester group, then optionally by a subsequent hydrolysis reaction.

Abstract: The invention relates to an N-sulfomethylglycinate of formula:HO.sub.3 S--CH.sub.2 --NH--CH.sub.2 --COOR.sub.1 (I)COOR.sub.1 being a hydrolysable carboxylic ester group.It also relates to a process for the preparation of the compound of formula (I) consisting in putting in contact sulfur dioxide, formaldehyde, and glycine in the presence of a R.sub.1 OH alcohol, or glycinate.It also relates to the use of the compound of formula (I) for the preparation of herbicides of the glyphosate type of reaction with a phosphite or a phosphonate of formula (R.sub.2 O).sub.2 P(O) H in which (R.sub.2 O).sub.2 P is a hydrolysable phosphonic ester group, then optionally by a subsequent hydrolysis reaction.

Abstract: The present invention relates to a process for the preparation of perhaloalkylthioethers by bringing a perhaloalkyl halide, preferably a bromide or an iodide, into contact with a disulphide in the presence of zinc and of sulphur dioxide or of a dithionite or of a hydroxymethanesulphinate or of a formate anion and sulphur dioxide.