Preparation of bis(organothio) alkanes
AssigneePhillips Petroleum Company
InventorJames E. Shaw
Life of this patent
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Abstract
A bis(organothio) alkane, such as 1,2-bis(methylthio) hexane, is synthesized by reacting an alkene, such as 1-hexene, with an excess amount of a disulfide thiolating agent, such as dimethyl disulfide, in the presence of a catalytic amount of a catalyst, such as a boron trifluoride dialkyl etherate. The reaction can be carried out at from about 20.degree. to about 150.degree. C. and under a pressure of from about 0 to 20 atms. The bis(organothio) alkane is useful in ore flotation process as a flotation agent for ores containing metal sulfide minerals.
Claims18
A process for preparing a bis(organothio) alkane having the formula of RCH(SR")CH(SR")R' comprising contacting an alkene having the formula of RCH.dbd.CHR' with an amount of a thiolating agent having the formula of R"SSR" in the presence of a catalyst, wherein said amount is from about 1.2 to about 10.0 in terms of mole ratio of said thiolating agent to said alkene, wherein said catalyst is selected from the group consisting of boron trichloride, boron tribromide, boron trifluoride, aluminum chloride, and a boron trifluoride dialkyl etherate. and wherein R is an alkyl group having 1 to 20 carbon atoms, R' is hydrogen and R" is an alkyl or aryl group having 1 to 10 carbon atoms.
A process for preparing 1,2-bis(methylthio) hexane comprising contacting 1-hexene with an amount of dimethyl disulfide in the presence of a catalytic amount of boron trifluoride diethyl etherate, wherein said amount is from about 1.2 to about 10.0 in terms of mole ratio of said dimethyl disulfide to said 1-hexene.
A process for preparing 1,2-bis(methylthio) octane comprising contacting 1-octene with an amount of dimethyl disulfide in the presence of a catalytic amount of boron trifluoride diethyl etherate, wherein said amount is from about 1.0 to about 10.0 in terms of mole ratio of said dimethyl disulfide to said 1-octene.
Dependencies are inferred from the claim text.