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<p>and the <a href="page.php?w=Heck_reaction">Heck reaction</a> show catalytic cycles.</p>

<p>A catalytic cycle is not necessarily a full reaction mechanism. For example, it may be that the <a href="page.php?w=Reactive_intermediate">intermediates</a> have been detected, but it is not known by which mechanisms the actual <a href="page.php?w=elementary_reaction">elementary reaction</a>s occur.</p>

<p><big>Precatalysts</big></p>
<p><b>Precatalysts</b> are not catalysts but are precursors to catalysts.  Precatalysts are converted in the reactor to the actual</p><p>
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