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<p>coupling as the palladium halide group and the bulky organic residue move away from each other in the reaction sequence in a rotation step. The Heck reaction is applied industrially in the production of <a href="page.php?w=naproxen">naproxen</a> and the <a href="page.php?w=sunscreen">sunscreen</a> component <a href="page.php?w=octyl_methoxycinnamate">octyl methoxycinnamate</a>.  The naproxen synthesis includes a coupling between a brominated <a href="page.php?w=naphthalene">naphthalene</a> compound with <a href="page.php?w=ethylene">ethylene</a>:</p><p>
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