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The structure of ascrobyl palmitate contains a vinyl group, so I assume the red proton would be: enter image description here

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    $\begingroup$ What about the other OH group on the other side of the double bond? $\endgroup$ Mar 19, 2017 at 18:52

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The other H (hydrogen) will be more acidic. The ascorbate anion is stabilized by electron delocalization, as I have show below in terms of resonance between two canonical forms.

ascorbate anion resonance

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