By treating α. ω-polybutadienyl dilithium with 2-3 equivalents of N-acetyl aziridine in hydrocarbon solvents and the subsequent hydrolysis and separation

the aminoethyl terminated polybutadiene was obtained. The molecular weight and functionality of the product were determined to be about 3000 and around 2 respectively as expected.The total 1

4 units in the main chain was found to be over 90%

and the cis-from accounted to be about one third of the 1

4 units.