or Pd;D1, D2, and G collectively comprise the neutral bidentate ligand;D1 and D2 are monodentate donors linked by a bridging group G, wherein at least one of D1 and D2 is ligated to the metal M by a nitrogen atom substituted by a 1-pyrrolyl or a substituted 1-pyrrolyl group;T is H, hydrocarbyl, substituted hydrocarbyl, or other group capable of inserting an olefin;L is an olefin or a neutral donor