• dienes;
  • homogeneous catalysis;
  • iron;
  • isoprene;
  • polymerization

In Scheme 1 of this communication an error was introduced in the course of the editorial typesetting process. Polymerization of isoprene in the presence of catalyst 2 yields 1,4-polyisoprene not with a trans/cis ratio of >99:1 but with a cis/trans ratio of >99:1, as is shown in the corrected version of Scheme 1 below.

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Scheme 1. Polymerization of isoprene using precatalysts 1 and 2. Complex 1 affords trans-1,4-polyisoprene preferentially, whereas complex 2 affords cis-1,4-polyisoprene preferentially. The 3,4-insertion motif is a minor component in both polymers (7–8 % content for 1, and 15 % content for 2). R=iBu for 1 and Et for 2.

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