Negative temperature coefficient phenomenon in exchange reactions between alkene oxides and alkyl-?-hydroxyalkyl sulfides

Exchange reaction of oxiranes with β-hydroxyalkyl sulfides, selenides,-amines, and-phosphines

“…16 The dependence of the initial rate (Wo) of the forward reaction of propylene oxide with ([3-hydroxyethyl) (n-octyl) sulfide on temperature in the 60--100~ range passes through a maximum at 90~ (Fig. 2)_ This finding cannot be explained in terms of Schemes 8--10.…”