When reacts with two equivalents of CH3I, the following double sulfonium salt precipitates:

(a) Give a curved-arrow mechanism for the formation of this salt.

(b) Upon closer examination, this compound is found to be a mixture of two isomers with melting points of 123–124 °C and 154 °C, respectively. Explain why two compounds of this structure are formed. What is the relationship between these isomers?

Transcribed Image Text:

CH₂CH₂SCH₂CH₂SCH₂CH₂