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Two new dammarane-type glycosides from Phlomis umbrosa

Ming-Ming Ding1, Fu-Lin Yan, Jing Tan

  • 1a School of Pharmacy, Xinxiang Medical University , Xinxiang , 453003 , P.R. China.

Natural Product Research
|August 27, 2013
PubMed

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Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.