Phosphasalen Indium Complexes Showing High Rates and Isoselectivities in <i>rac</i>
-Lactide Polymerizations
作者:Dominic Myers、Andrew J. P. White、Craig M. Forsyth、Mark Bown、Charlotte K. Williams
DOI:10.1002/anie.201701745
日期:2017.5.2
leading bioderived polymer produced commercially by the metal‐catalyzed ring‐opening polymerization of lactide. Control over tacticity to produce stereoblock PLA, from rac‐lactide improves thermal properties but is an outstanding challenge. Here, phosphasalen indium catalysts feature high rates (30±3 m−1 min−1, THF, 298 K), high control, low loadings (0.2 mol %), and isoselectivity (Pi=0.92, THF, 258 K)
聚丙交酯(PLA)是领先的生物衍生的聚合物,通过金属催化丙交酯的开环聚合反应而商业化生产。从外消旋丙交酯生产立体嵌段PLA的策略控制可以改善热性能,但这是一个艰巨的挑战。在此,磷asalen铟催化剂具有高速率(30±3 m -1 min -1,THF,298 K),高控制,低载量(0.2 mol%)和等选择性(P i = 0.92,THF,258 K)。此外,磷磷灰石铟催化剂不需要任何手性添加剂。