isotope and t-butyl alcohol mechanism drawing

[jcais]

Hello

 

I have a question for you all regarding incorporating an isotope into an alcohol. I just have to show the mechanism. I checked 2 textbooks and google but no help.

 

T-butyl alcohol is treated with H218O and sulfuric acid. The end product looks just like the beginning, but now the t-butyl alcohol has a 18 in front of the O for the isotope. How do you think this was done? How should I draw it?

__|__OH H218O

| H2SO4

--> __|__18OH

|

Thank you for your time and help.