The site on a chain carrier at which reaction occurs.
Note: In the Gold Book,[1] the terms “active center” and “active site”
are defined with reference to heterogeneous catalysis and the term
“reactive site” is used within the definition of chain polymerization.
Jenkins, A. D..; Jones, R. G.; Moad, G. Pure Appl. Chem., 2010, 82(2), 483-491
An active center (sometimes called active site or kinetic-chain carrier) in polymer science refers to the site on a chain carrier at which reaction occurs.[2]