Oxopiperidinium salts

Denmark and coworkers reported 4-oxopiperidinium salt 17 to be an effective catalyst under biphasic conditions (Fig. 6) [44, 45]. The choice of the alkyl groups on the nitrogen affects the lipophilicity of the ketone, thus influencing the partitioning... 

In 1995, Denmark and co-workers [77, 80-83] described 4-oxopiperidinium salts as good catalysts. We have only mentioned for the oxidation of olefins. They can act... 

A number of ketone catalysts have been developed. Crucial considerations are solubility and stability. As an example, catalytic amounts of ammonium salts such as Thexyl-l-methyl-4-oxopiperidinium triflate with Oxone in a buffered water-dichloromethane mixture are effective oxidation agents (Equation 69) <1995JOC1391>. Other... 

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