Which would be more wanting to oxidise, trialkylphosphine into trialkylphosphine oxide, or dialkylsulfide into dialkylsulfoxide?
Sulfur is less electronegative so should be more willing to give up those electrons, and also is only going up to the +4 oxidation state, whereas phosphorus needs to get to +5. However phosphorus is very oxophilic, more so than sulfur according to this paper. So I'm unsure.Article A Quantitative Scale of Oxophilicity and Thiophilicity
Bonus points if you know how much less the equivalent phosphite/sulfite would want to oxidise.
I feel , trialkylphosphine will oxidize earlier than dialkylsulphide for the simple two reasons , presence three molecules of alkyl and phosphorous in the former , since phosphorous has lower redox potential than sulphur ..
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