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Mechanism for thionation


ppdj

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Hi all,

I need help in determining the mechanism for the thionation of lactones by P4S10 + hexamethyldisiloxane. The specific paper I am referring to is Curphey, T. J. J. Org. Chem. 2002, 67, 6461-6473. The author there mentions about oxygenating the P4S10 initially, followed by the cleavage of P-O-P units by hexamethyldisiloxane. What I don't understand is how to show this transformation by arrows for something like 7-membered lactone.

Any help on this would be greatly appreciated.

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