Stannylated polynorbornenes as new reagents for a clean Stille reaction.
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.
Carrera
Nora
N
IU CINQUIMA/Química Inorgánica, Universidad de Valladolid, 47071-Valladolid, Spain.
Gutiérrez
Enrique
E
Benavente
Rut
R
Villavieja
M Mar
MM
Albéniz
Ana C
AC
Espinet
Pablo
P