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<p>is about -430&nbsp;mV.</p>

<p><big>Synthesis</big></p>
<p>Disulfide bonds are usually formed from the <a href="page.php?w=oxidation">oxidation</a> of <a href="page.php?w=thiol">thiol</a>  groups, especially in biological contexts. The transformation is depicted as follows:<br/>
:<chem>2 RSH <=> RS-SR + 2 H+ + 2 e-</=></chem>A variety of oxidants participate in this reaction including oxygen and <a href="page.php?w=hydrogen_peroxide">hydrogen peroxide</a>. Such reactions are thought to proceed via <a href="page.php?w=sulfenic_acid">sulfenic acid</a> intermediates.</p><p>
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