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There seems to be multiple forms of HI used to cleave epoxides:

conc. HI, anhydrous HI, cold HI, hot HI, cold conc. HI, hot conc. HI, etc.

So, does concentration of HI and temperature have any significance in determining the product?

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for unsymmetrical epoxides or oxiranes reaction takes place in this way:

in acidic medium- ring on reaction with HI ring opens from more hindered side i.e., the more hindered C-O bond. So the carbon in which more number of groups are attached which is bonded to the oxygen in ring gets -I.

in basic medium- the ring opens from less hindered side.

temperature is not a much important factor in this reaction.

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    $\begingroup$ Welcome to chemistry.se! While there is certainly some truth to what you have written, I think it would be better to beck it up with some references; especially the last sentence. I also think this does not address the question completely. $\endgroup$ – Martin - マーチン Mar 25 at 15:20

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