Processes for the preparation of macrocyclic ketones

   
   

Disclosed are a process of subjecting a diester of a long-chain dicarboxylic acid having 18 to 21 carbon atoms to intramolecular condensation in the presence of titanium tetrachloride or zirconium tetrachloride and a trialkylamine to form an .alpha.-alkoxycarbonylated macrocyclic ketone, and a process for producing a macrocyclic ketone by hydrolyzing an .alpha.-alkoxycarbonylated macrocyclic ketone obtained by the process and then subjecting the hydrolyzate to decarboxylation. The invention provides a process for producing a macrocyclic ketone efficiently, which permits high concentration synthesis.

Se divulgan un proceso de sujetar un diester de un ácido dicarboxylic de larga cadena que tiene 18 a 21 átomos de carbón a la condensación intramolecular en la presencia del tetracloruro titanium o del tetracloruro del circonio y un trialkylamine para formar una cetona macrocyclic del alpha.-alkoxycarbonylated, y un proceso para producir una cetona macrocyclic hidrolizando una cetona macrocyclic del alpha.-alkoxycarbonylated obtenida por el proceso y después sujetando el hydrolyzate al decarboxylation. La invención proporciona un proceso para producir una cetona macrocyclic eficientemente, que permite alta síntesis de la concentración.

 
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