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US 5,283,337 AGranted
Process for the preparation of perhaloalkylthioethers
AssigneeRhone-Poulenc Agrochimie
InventorsClaude Wakselman, Marc Tordeux, Bernard Langlois, Jean-Louis Clavel, Roland Nantermet
Life of this patent
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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.
Claims22
A process for the preparation of perhaloalkylthioethers which comprises bringing into contact, optionally in a solvent:
- (1) a reducing agent consisting of an alkali metal dithionite, or consisting of an alkali or alkaline-earth metal or metal hydroxymethanesulphinate, or consisting of a formate anion and sulphur dioxide,
- (2) a disulphide, and
- (3) a compound of the formula
- XCFYT (II)
- wherein Y and T are independently of each other a halogen atom selected from the group consisting of fluorine, chlorine and bromine, or a C.sub.1 -C.sub.11 perhaloalkyl chain, and X is a halogen atom selected from the group consisting of chlorine, bromine and iodine.
2 more elements
Dependencies are inferred from the claim text.