摘要:
An olefin-metathesis catalyst is provided. The olefin-metathesis catalyst includes a magnetic carrier, a polymer having formula (I) grafted on the magnetic carrier, and a ruthenium complex loaded on the polymer. A method for preparing low-molecular-weight nitrile butadiene rubber is also provided. In formula (I), one of X, Y and Z is nitrogen atom, the others are carbon atoms, R1 and R2, independently, include hydrogen, ester group, C1-10 alkyl group, C3-8 cycloalkyl group, 4-ring to 8-ring heterocycloalkyl or C6-10 aryl group, R3 includes hydrogen or C1-10 alkyl group, m ranges from 10 to 2,000, and n ranges from 0 to 1,000.