Lanthanide methoxides supported by carbon-bridged bis(phenolate)ligands 2,2'-methylene-bis(6-tert-butyl-4-methylphenoxo)(MBMP2-)[(MBMP)Ln(μ-OMe)(THF)2]2(Ln=Nd(1),Yb(2))were synthesized in high yields by the protolysis reaction using(C5H5)3Ln(THF)as starting materials,and complex 1 was structurally characterized.The coordination geometry around the center metal can be best described as a distorted octahedron.Complexes 1 and 2 were shown to be efficient initiators for the ring-opening polymerization of 2,2-dimethyltrimethylene carbonate(DTC)and L-lactide.The mechanism of DTC polymerization was explored by the end group analysis of the oligomer.