Catalytic system for aldol reactions

   
   

The invention relates to a process for the preparation, in a single step, of enones by an aldol condensation of a ketone, such as a gem-dimethyl cyclohexylethanone or gemdimethyl cyclohexenylethanone derivative, with an aldehyde in the presence of a novel catalytic system and a co-ingredient, such as a carboxylic acid anhydride or an anhydrous salt, and without the pre-formation of an enolate. The catalytic system is a metal complex, such as a [(Cl).sub.n (alkoxy).sub.4-n Ti] or [(Cl).sub.n (alkoxy).sub.4-n Zr] complex where n is 1 to 3.

La invención se relaciona con un proceso para la preparación, en un solo paso, de enones por una condensación del aldol de una cetona, tal como un derivado gema-gem-dimethyl del cyclohexenylethanone del cyclohexylethanone o del gemdimethyl, con un aldehino en la presencia de un sistema catalítico de la novela y de un co-ingrediente, tal como un anhídrido del ácido carboxylic o una sal anhidra, y sin la pre-formacio'n de un enolate. El sistema catalítico es un complejo del metal, tal como a [ (Cl).sub.n (ti de alkoxy).sub.4-n ] o [ complejo (de Cl).sub.n (zr de alkoxy).sub.4-n ] donde está 1 a 3 n.

 
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