Process for preparing 2,6-di-tertiarybutyl-4-mercaptophenol

In a process of making 2,6-ditertiarybutyl-4-mercaptophenol by sulfurization of 2,6-ditertiarybutylphenol and reduction of the sulfurization product in the presence of a zinc catalyst and acid, the improvement which comprises contacting the zinc with an amount of lead which is catalytic for said reduction prior to carrying out the reduction.

In a process for making 4,4'-isopropylidene-dithio-bis-(2,6-di-tertiarybutylphenol) by reduction of a bis(3,5-di-tertiarybutyl-4-hydroxyphenyl)polysulfide in the presence of a zine catalyst and acid, and reacting the reduction product with acetone under acidic conditions, the improvement which comprises contacting the zinc with an amount of lead which is catalytic for said reduction prior to carrying out the reduction.

In a process for making 2,6-di-tertiarybutyl-4-mercaptophenol by reduction of a bis(3,5-di-tertiarybutyl-4-hydroxyphenyl)polysulfide in the presence of a zinc catalyst and acid, the improvement which comprises conducting the reduction in the presence of an amount of lead which is catalytic for said reduction.

In a process for making 2,6-di-tertiarybutyl-4-mercaptophenol by sulfurization of 2,6-di-tertiarybutylphenol and reduction of the sulfurization product in the presence of a zinc catalyst and acid, the improvement which comprises conducting said reduction in the presence of an amount of lead which is catalystic for said reduction.

In a process for making 4,4'-isopropylidenedithio-bis-(2,6-di-tertiarybutylphenol) by reduction of a bis(3,5-di-tertiarybutyl-4-hydroxyphenol)polysulfide in the presence of a zinc catalyst and acid, and reacting the reduction product with acetone under acidic conditions, the improvement which comprises conducting said reduction in the presence of an amount of lead which is catalytic for said reduction.