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Bis-N-alkenyl substituted piperidines are valuable intermediates for the preparation of pharmacologically active compounds, e.g. compounds containing a phenyl group and a tertiary amine. It has already been disclosed that piperidines substituted with aryl groups can be obtained by reaction of a piperazine with a halogenated aromatic compound in the presence of a copper catalyst. The reaction requires high temperatures (60.degree. C. to 140.degree. C.) and a long reaction time (3 to 9 days). It is further known to prepare bis-N-alkenyl substituted piperidines by heating a mixture of a piperazine and a cyclic amine in the presence of a phosphine catalyst. Although less severe reaction conditions can be applied in this case, the yields are poor.
It is an object of this invention to provide a process for the preparation of bis-N-alkenyl substituted piperidines. Another object of the invention is to provide a process for the preparation of a large number of structurally very different bis-N-alkenyl substituted piperidines in high yields. A further object of the invention is to 0b46394aab