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Polymerizations of   l -lactide catalyzed either by neat SnCl 2  or by SnCl 2  + difunctional cocatalysts were conducted in bulk at 180, 160 and 140 °C with variation of the Lac/Cat ratio and time. With neat SnCl 2  poly(L-lactide) having weight average molecular weights (uncorrected M w ’s) up to 190 000 g mol −1  were obtained mainly consisting of linear chains. Addition of salicylic acid or 1,1-bisphenol yielded a higher fraction of cyclic polylactides but lower molecular weights. Furthermore, SnCl 2  was compared with Bu 2 SnCl 2  and various other metal chlorides and the best results were obtained with SnCl 2 . With ethyl L-lactate as initiator SnCl 2 -catalyzed ROPs were performed at 120 °C and the lac/initiator ratio was varied. All these experiments were conducted under conditions allowing for comparison with ROPs catalyzed with neat Sn(II)-2-ethyhexanoate. Such a comparison was also performed with ε-caprolactone as monomer.

Polymerization of l-lactide with SnCl2: A Low Toxic and Eco-friendly Catalyst