In this task, you are given a sentence in the English language. Your job is to translate the English sentence into the Spanish language.

What role does dimethyl sulfide play in the alkylation reaction it undergoes when it is reacted with methyl iodide ?
¿Qué papel desempeña el sulfuro de dimetilo en la reacción de alquilación que sufre cuando se le hace reaccionar con yoduro de metilo?