TMPZnN(SiMe3)2, [TMPZn(μ-OiPr)]2 and TMPZn[OCMe2C(O)OEt]. Their role in the ring-opening of rac-lactide and ε-caprolactone where TMP = 1,5,9-trimesityldipyrromethene

The title compounds are active in the polymerization of lactide and ε-caprolactone and in contrast to other related compounds their reactions are faster in THF relative to DCM. Other compounds show a marked preference for DCM relative to THF.153