Abstract
This contribution describes the operation of a pilot plant for the production of 3-exomethylene-7(R)-glutaroylaminocepham-4-carboxylic acid 1(S)-oxide (4a) by the electrochemical reduction of 3-acetoxymethyl-7(R)-glutaroylaminoceph-3-em-4-carboxylic acid 1(S)-oxide (3a). This conversion is a key step in a new process for the production of Ceftibuten (1). The scale-up of the electrochemical reduction was demonstrated using a commercial flow-cell. The use of a novel type of extended-area tin cathode, which had been shown on a laboratory scale to produce significant improvements in the process, was successfully implemented in an ICI FM21-SP commercial-scale electrochemical reactor.
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