(a) Two isomeric S"2 products are possible when sodium thiosulfate is allowed to react with one equivalent of methyl iodide in methanol solution. Give the structures of the two oroducts.


(Thiosulfate is an example of an ambient, or "two toothed," nucleophile. )
(b) In fact, only one of the two possible products is formed. Which one is formed, and whv?