Abstract

The catalytic activity of aluminum and gallium compounds with the noninnocent acenaphthene-1,2-diimine ligand dpp-bian (=1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene) in the ring-opening polymerization of lactic acid lactides is studied. It is shown that in this process the homobimetallic compounds of aluminum and gallium of the composition [(dpp-bian)Mt]₂ exhibit a low activity and do not provide control over the molecular weight characteristics of the resulting polymers. On the contrary, in the presence of the (dpp-bian)Ga(OCH₂CH₂NMe₂) metal complex the polymerization of lactide proceeds in a controlled manner and the reaction is of the first order with respect to the monomer. The aluminum analog of the mononuclear gallium alkoxide complex is catalytically inactive in the polymerization of lactide.

中文翻译：

---

丙交酯聚合中铝和镓的ena-双（芳酰胺）配合物

摘要

铝和镓化合物与非纯-1,2-二亚胺配体dpp-bian（= 1,2-双[（2,6-二异丙基苯基）亚氨基] ac]在乳酸的开环聚合中的催化活性研究丙交酯。结果表明，在该方法中，组成[（dpp-bian）Mt] ₂的铝和镓的同双金属化合物显示出低活性，并且不能控制所得聚合物的分子量特征。相反，在（dpp-bian）Ga（OCH ₂ CH ₂ NMe ₂）的存在下）金属配合物丙交酯的聚合以可控方式进行，并且该反应相对于单体是一级的。单核烷醇镓配合物的铝类似物在丙交酯的聚合中是催化惰性的。