The reaction of SmN(SiMe3)2}3 with the bis(phenol)amines H2O2NR (H2O2NR = RCH2CH2N(2-HO-3,5-C6H2tBu2)2; R = OMe, NMe2 or Me) gave exclusively zwitterions Sm(O2NR)(HO2NR). For R = OMe or NMe2 these were efficient catalysts for the ring-opening polymerisation of ε-caprolactone and D,L-lactide with a tendency to form cyclic esters; in contrast, no polymerisation was observed for R = Me.
SmN(SiMe3)2}3与双
酚胺H2O2NR(H2O2NR = RCH2CH2N(2-HO-3,5-C6H2tBu2);R = OMe、NMe2或Me)的反应主要生成两性离子Sm(O2NR)(HO2NR)。对于R = OMe或NMe2,这些化合物是
ε-己内酯和D,
L-乳酸开环聚合的有效催化剂,并且有形成环状酯的倾向;而对于R = Me,则未观察到聚合反应。