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US 5,401,883 AGranted
Process for preparing 2,6-di-tertiarybutyl-4-mercaptophenol and 4,4'-isopropylidenedithio-bis-(2,6-di-tertiarybutylphenol)
AssigneeMerrell Dow Pharmaceuticals Inc.
InventorsF. Mark Laskovics, Kim G. Bargeron
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Abstract
This invention relates to an improvement in a process for making 2,6-di-tertiarybutyl-4-mercaptophenol and 4,4-isopropylidenedithio-bis-(2,6-di-tertiarybutylphenol) which comprises reduction of bis (3,5-di-tertiarybutyl-4-hydroxyphenyl)polysulfide with hydrogen gas at a temperature range of from about 20.degree. C. to about 90.degree. C. in the presence of a catalytic amount of cobalt-molybdenum catalyst.
Claims12
A process for making a compound of the formula:
- ##STR3## which is substantially free of reaction by-products comprising reducing bis(3,5-di-tertiarybutyl-4-hydroxy-phenyl)polysulfide with hydrogen gas in the presence of a catalytic amount of a sulfided cobalt-molybdenum catalyst further comprising from about 4.5% to about 5.0% cobalt oxide and from about 15.5% to about 16.2% molybdenum trioxide, wherein the temperature of the reaction is from about 20.degree. C. to about 90.degree. C.
A process for making a compound of the formula:
- ##STR4## which is substantially free of reaction by-products comprising reducing bis(3,5-di-tertiarybutyl-4-hydroxy-phenyl)polysulfide with hydrogen gas in the presence of a catalytic amount of cobalt-molybdenum catalyst further comprising from about 4.5% to about 5.0% cobalt oxide and from about 15.5% to about 16.2% molybdenum trioxide, to get a mercaptophenol reaction product wherein the temperature of the reaction is from about 20.degree. C. to about 90.degree. C., and further reacting the reaction product with acetone under acidic conditions.
Dependencies are inferred from the claim text.