Ring-Opening Copolymerization of (R)-.beta.-Butyrolactone with (R)-3-Methyl-4-oxa-6-hexanolide: A New Biodegradable Poly(ester-ether)

Ring-Opening Copolymerization of (R)-β-Butyrolactone with Cyclic Carbonates: New Biodegradable Poly(ester carbonate)s

“…The T g value of the copolymer (P[( R )-3HB- co -6HH]) decreases with increasing content of 6HH units and approaches −67 °C of polycaprolactone (P(6HH)) . A similar phenomenon was observed for P[( R )-β-BL- co -( R )-MOHEL] obtained by copolymerization of ( R )-β-BL with ( R )-3-methyl-4-oxa-6-hexanolide (( R )-MOHEL) . From the relationship between the T g value of copolymers 4a−4e and the content of 3HB units, it is considered that the T g value of P(DMC) is about 5 °C.…”

“…We reported on the ring-opening copolymerization of ( R )-β-butyrolactone (( R )-β-BL) with several lactones using distannoxane complexes ( 1 ) as new catalysts to obtain a new series of biodegradable PHAs − which are difficult to obtain by a fermentation method. Further, we reported on the preparation of a biodegradable poly(ester ether) by the ring-opening copolymerization of ( R )-β-BL and ( R )-3-methyl-4-oxa-6-hexanolide …”

1,1,3,3-Tetrabutyl-1,3-diisothiocyanatodistannoxane

“…In particular, the commercially available [(NCS)(n-Bu) 2 SnOSn(n-Bu) 2 (OH)] 2 (10) has been utilized to catalyze esterification, 29-31 polyesterification, 32 and ring-opening copolymerization processes. 33 The commercially available [(Cl)(n-Bu) 2 SnOSn(n-Bu) 2 (Cl)] 2 has been employed as a transesterification catalyst in natural product total syntheses. 34 The related [(Cl)(n-Bu) 2 SnOSn (n-Bu) 2 (OH)] 2 also catalyzes ring-opening copolymerizations, 33,35-37 macrolactonizations, 12 transesterifications.…”

Novel Aliphatic Polyesters Based on Functional Cyclic (Di)Esters

“…The seven-membered compounds 1,5-dioxepan-2-one (36a), [82][83][84][85][86] 4-methyl-1,5-dioxepan-2-one (37a) [87,88] are precursors of poly(ester-ether)s. Albertsson et al have reported an efficient route to prepare 36a, and studied the polymerization of this monomer and copolymerization with other lactones. Synthesis and polymerization of 37a have been investigated by Hori and Yamaguchi [87] and Yasuda et al [88] Bis(e-caprolactone-4-yl) (38a) and 2,2-bis(e-caprolactone-4-yl)propane (39a) are difunctional monomers which can be used to crosslink aliphatic polyesters such as poly(36a). Deng et al [89] have initiated the polymerization of 3-phenyl-e-CL (40a) and 5-phenyl-e-CL (41a) with a tin(II) salt, Al(O i Pr) 3 , and cyclopentadienyl sodium.…”