# Products formed on cleavage of epoxides using HI

There seems to be multiple forms of $$\ce{HI}$$ used to cleave epoxides:

conc. $$\ce{HI}$$, anhydrous $$\ce{HI}$$, cold $$\ce{HI}$$, hot $$\ce{HI}$$, cold conc. $$\ce{HI}$$, hot conc. $$\ce{HI}$$, etc.

So, does concentration of $$\ce{HI}$$ and temperature have any significance in determining the product?