| 摘要 |
<p>A process for producing coumarin and substituted coumarins starting from substituted hexahydrocoumarins or from substituted dihydrocoumarins. The process includes dehydrogenation in the presence of catalysts based on metals of Group VIII of the periodic table of the elements and in the presence of at least one easily reducible organic compound. The invention allows to achieve exceptionally high yields that do not require the recycling of the hexahydrocoumarin or of the dihydrocoumarin that are present at the end of the reaction, and also allows to achieve high selectivity and easy purification.</p> |
