title: Organotin(IV) compounds as intramolecular transesterification catalysts in thermal depolymerization of poly(L-lactic acid) oligomer to form LL-lactide.
abstract: Mono-, di-, and tetraalkyl tin(IV) compounds were evaluated for the intramolecular transesterification reaction of the thermal depolymerization of poly(L-lactic acid) oligomer forming lactide by gas chromatography using a beta-cyclodextrin stationary phase capillary column. The most active catalyst was found to be monobutyltin trichloride (BuSnCl3) (8), which contains tin-halogen bonds, and the least effective was the coordinatively saturated monoorganotin derivative, monobutyltin tris(2-ethylhexanoate) (7). Coordination of the carbonyl group in the oligomer to the tin catalysts is an important factor influencing its activity.
authors.affiliation: Technology Research Laboratory, Shimadzu Corporation, Kyoto, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Noda
mesh_terms: D002384:Catalysis; D002849:Chromatography, Gas; D004951:Esterification; D019344:Lactic Acid / Q000737:chemistry*; D009947:Organotin Compounds / Q000737:chemistry*; D011091:Polyesters; D011108:Polymers / Q000737:chemistry*
chemical_list: D009947:Organotin Compounds; D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; C033616:poly(lactide)