Polymere aus Nitrilen, 5. Anionische polymerisation von fumaronitril. Kinetik und Mechanismus zur synthese eines molekulareinheitlichen oligomeren

Fumaronitrile can polymerize quantitatively under mild conditions with anionic initiators. With the initiator butyllithium the kinetics is examined with the help of the 1H NMR method. The mechanism of the polymerisation is described which is different in polar and unpolar solvents. In THF an electrontransfer mechanism is responsible for a molecularly uniform oligomer of structure 5 which does not contain the initiator. In benzene or hexane normal anionic addition of the initiator to the CN‐group of the monomer leads to oligomer 7.