Hydrogen Sulfide → O,O'-Diisobutyl dithiophosphate

Participants

Reaction Conditions

Reaction Steps

Into a four-necked flask equipped with a stirrer, condenser, dropping funnel and thermometer were added 608 g (8.2 moles) of 2-methyl-1-propanol and the contents were heated to 60° C. At that temperature, 444.5 g (2.0 mole) of phosphorus pentasulfide was added portion-wise over a 3-hour period with agitation. After all of the sulfide reactant was introduced, the temperature was raised to 65° C. and held for 3 hours. The evolution of hydrogen sulfide gas was trapped by a caustic scrubber which indicates a substantially complete reaction. The reaction was then allowed to cool to ambient temperature under a nitrogen blanket and the solution was filtered through diatomaceous earth to produce a greenish fluid (927 g) as the desired phosphorodithioic acid.

Provenance & Evidence