GPC analysis of polylactides produced by the neutral dizinc triiodide precatalysts resulted in moderate dispersities (Ð = 1.18-1.38) and number-average molecular weights (Mn) comparable to the theoretical value for controlled polymerization with two polymer chains per complex. PD 4-tBu Zn2I3 (1) provided the closest correspondence between experimental Mn (14,900) and this theoretical Mn (14,300; entry 10). By contrast, ZnI2 similarly resulted in a Mn value (6,260) less than half the theoretical value for one chain per metal and closer to the theoretical value for two chains per metal (7,130).