From homogeneously to heterogeneously catalyzed cyclopropanation reactions: New polymeric membranes embedding cobalt chiral schiff base complexes
✍ Scribed by Alessandro Caselli; Maria Giovanna Buonomenna; Federico de Baldironi; Luca Laera; Simone Fantauzzi; Fabio Ragaini; Emma Gallo; Giovanni Golemme; Sergio Cenini; Enrico Drioli
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 851 KB
- Volume
- 317
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
In this paper we report the preparation of catalytic polymeric membranes having the complex [(N,Nbis(3-tert-butyl-5-(heptadecafluorooctyl)salicylidene)-trans-1,2-cyclohexanediamine)Co] embedded into Hyflon AD60X, PES and PSf and their use in the cyclopropanation reaction of olefins with ethyl diazoacetate (EDA). A study of the reaction in the homogeneous phase was also performed. The kinetics of the cyclopropanation reaction is first-order in the diazoacetate and the catalyst and zero order in the olefin, but we observed a more complex dependence on the additive, NMI (N-methylimidazole). The positive effect of the additive is completely reversed at NMI concentration higher than 6•10 -2 M.