cyclohexamer [2·Na]+ and [2·2Na]2+. Na+ complexes were investigated by means of spectroscopic (NMR), computational (DFT) and X-ray crystallographic studies. The first application of these complexes as catalysts in the ring opening polymerization (ROP) of L-lactide (L-LA) was examined. Our studies suggest that, for the intrinsic properties of the catalytic site (revealed by steric topographic maps) the homooligomeric
环状拟肽是
生物相容的/由可
生物降解的构成cyclooligomers ñ -取代的甘
氨酸表示与第一组的碱
金属高结合常数(ķ一〜10 6的Na +,
锂+和K +)在有机溶剂中。合成了三个新的带有N-苄基侧链的
金属化物种(环状五聚体[[ 1 ·2Na] 2+和两个环八聚体[ 3 ·Na] +和[ 3 ·2Na] 2+拟肽),并与已知的N-过苄基化的环六聚体[ 2· [ Na] +和[ 2 ·2Na] 2+。Na +络合物通过光谱学(NMR),计算学(DFT)和X射线晶体学研究进行了研究。研究了这些络合物作为催化剂在
L-丙交酯(L -
LA)的开环聚合(ROP)中的首次应用。我们的研究表明,对于催化位点的固有性质(通过空间形貌图显示),均聚低聚五聚体[ 1 ·2Na] 2+是环聚低聚家族中最活跃的成员。