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Reference.org
6+4 Cycloaddition
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<p>[6+4] Cycloaddition is a type of <a href="/facts/Cycloaddition/Gme6TDFP">cycloaddition</a> between a six-atom pi system and a four-atom pi system, leading to a ten-membered ring. Because this is a higher-order cycloaddition, issues of periselectivity arise in addition to the usual concerns about regio- and stereoselectivity. Six-atom pi systems that have been employed in the reaction include <a href="/facts/Tropone/s21KNYTK">tropone</a> and tropone derivatives, <a href="/facts/Fulvene/xJ8tACff">fulvenes</a>, and cycloheptatriene cobalt complexes. </p>