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A microwave-assisted flow reactor for organic synthesis

By Tetsuo Satoh |

Saida FDS Inc. (Shizuoka, http://saidagroup.jp/fds_en/) has commercialized a flow reactor that uses microwaves to produce fine chemicals and pharmaceutical intermediates at high temperatures and pressures. The system has been shown to boost productivity by a factor of 3–6 compared to existing metal tubular flow-reactor systems that are externally heated. The reactor was developed with support from the New Energy and Industrial Technology Development Organization (NEDO), in collaboration with the National Institute of Advanced Industrial Science and Technology (AIST), University of Shizuoka, Shizuoka University and Gifu Pharmaceutical University. In September, Saida FDS began shipping the first commercial units in Japan, with microwave powers of 50, 100 and 200 W, and has obtained certification for supplying 100-W units overseas within the next year. The reactor is a bench-scale system that is rated for operation at temperatures up to 230°C and pressures to 2.5 MPa, and includes possibilities for realtime monitoring of continuous reactions. The reactor’s high productivity has been demonstrated for the Fisher indol synthesis of the pharmaceutical intermediate 2,3,4,9-tetrahydro-1H-carbazol from cyclohexane and phenylhydrazine.…
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