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<p> Related adducts form from <a href="page.php?w=dioxane">dioxane</a> and <a href="page.php?w=trimethylamine">trimethylamine</a>.</p>

<p><big>Sulfonating agent</big></p>
<p>Sulfur trioxide is a potent <a href="page.php?w=Sulfonate">sulfonating agent</a>, i.e. it adds SO<sub>3</sub> groups to substrates. Often the substrates are organic, as in <a href="page.php?w=aromatic_sulfonation">aromatic sulfonation</a>.  For activated substrates, Lewis base adducts of sulfur trioxide are effective sulfonating agents.</p>

<p><big>Preparation</big></p>
<p>The direct oxidation</p><p>
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