Two phase process for the preparation of azole and azoline disulfides
AssigneeExxon Research & Engineering Co.
InventorsStanley J. Brois, Antonio Gutierrez
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Abstract
Azole and azoline disulfides useful as corrosion inhibitors and antiwear agents are prepared by the halogen-induced coupling of a thiol reactant e.g., hydrocarbyl mercaptans, with a metal azole thiolate, e.g. the potassium salt of 3,5-bis-mercapto 1,2,4-thiadiazole or 2,5-bis-mercapto 1,3,4-thiadiazole in a 2-phase reaction medium comprising a mixture of a hydrocarbon and water.
Claims5
A process for the preparation of di- tri- and tetra- sulfide azoles or azolines comprising the sulfur chloride induced coupling of an olefin, sulfur chloride, and sulfur chloride being S.sub.x Cl.sub.2 wherein x=1-3 and an alkali metal or alkaline earth metal salt of a thiol substituted heterocyclic pentatomic azole or azoline, said metal salt and said sulfur chloride forming a thiosulfenyl chloride intermediate, said reaction being carried out in a stirred medium comprising an organic phase and an aqueous phase at a temperature of from about 0.degree. to about 90.degree. C., and recovering said product.
A process for the preparation of a 3,5-bis (alkenylthio) 1,2,4-thiadiazole product comprising the sulfur dichloride induced coupling of an olefin, sulfur dichloride and an alkali metal or alkaline earth metal salt of 3,5 bis-mercapto-1,2,4-thiadiazole with said salt and said sulfur dichloride forming a thiosulfenyl chloride intermediate, said reaction being carried out in a stirred medium comprising an organic phase or a mixed organic and aqueous phase at a temperature of from about 0.degree. to about 90.degree. C., and recovering said product.
Dependencies are inferred from the claim text.