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Topic: Use which reagents to prepare these compounds?  (Read 3183 times)

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Offline a confused chiral girl

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Use which reagents to prepare these compounds?
« on: November 30, 2006, 04:53:37 PM »
I'm wondering how I can draw the steps for these 2 compounds (sorry for my ugly drawings  ::)) from cyclopentanone , D2O, using any organic/inorganic reagents....and how many steps would it take?

thank you SO MUCH!!  ;D :D

Offline Custos

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Re: Use which reagents to prepare these compounds?
« Reply #1 on: November 30, 2006, 07:26:57 PM »
This is a question about keto-enol tautomerism, reduction of carbonyls and hydrogenation.
a) Because of the tautomerism you can easily get duteriums in the positions next to the carbonyl using just D2O and a trace of base (eg. potassium carbonate). Then reduce the carbonyl with sodium borohydride - locking the H into position (no more keto-enol tautomerism). Finally treat with D2O again to convert the alcohol to -OD.

For the second question you need to reduce the carbonyl from part (a) using sodium boroduteride (not hydride) to put deuteriums everywhere - then eliminate water (strictly you're eliminating D2O) using base. The to put in the final two hydrogens you can use hydrogenation of the double bond with hydrogen gas and a catalyst like palladium...

Here, a picture might help  ;)

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