Stannylated polynorbornenes as new reagents for a clean Stille reaction |
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Authors: | Carrera Nora Gutiérrez Enrique Benavente Rut Villavieja M Mar Albéniz Ana C Espinet Pablo |
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Institution: | IU CINQUIMA/Química Inorgánica, Universidad de Valladolid, 47071-Valladolid, Spain. |
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Abstract: | New functionalized polynorbornenes have been obtained in good yields by vinylic copolymerization of norbornene with a (norbornenyl)SnBu(2)Cl monomer, catalyzed by Ni(C(6)F(5))(2)(SbPh(3))(2)]. Subsequent functionalization produces a wide variety of polymers with different --SnBu(2)R groups (R=aryl, vinyl, alkynyl). The polymers can be used as R-transfer reagents in Stille couplings, thereby providing easy workup and separation of the polymeric tin byproducts from the coupling products. Tin contents of around 0.05 wt % are found in the Stille products. The stannylated polymers can be recycled and reused with good efficiency. |
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Keywords: | C?C coupling green chemistry polymers recycling tin |
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