Dual Catalysis of the Selective Polymerization of Biosourced Myrcene and Methyl Methacrylate Promoted by Salicylaldiminato Cobalt(II) Complexes with a Pendant Donor
作者:Xiaoyu Jia、Wenxin Li、Junyi Zhao、Feiyan Yi、Yunjie Luo、Dirong Gong
DOI:10.1021/acs.organomet.8b00708
日期:2019.1.28
activity and stability particularly at 60–80 °C for polymerizations of both monomers. The enhanced activity and selectivity observed in myrcene cis-1,4 polymerization promoted by the sulfur and oxygen containing catalysts may relate to the weak Co–X (X = O, S) interaction, facilitating myrcene coordination. However, the donor effect on MMA polymerization activity is reversed, with phosphine donated catalyst
钴配合物(Co1 - Co6)被苯氧基(4,6-二叔丁基-2-苯酚,萘-2-醇)-亚胺配体双螯合,后者含有侧链硬氧(Co1和Co4),软硫(Co2和Co5)或膦供体(Co3和Co6)被报道用于生物来源的月桂烯和甲基丙烯酸甲酯(MMA)的选择性聚合的双重催化。X射线分析表明,该配合物的特征是钴中心与酚酸氧,亚胺氮和侧链供体结合的八面体配位畸变(P代表Co3,S代表Co5)。由MMAO或Al活化在Bu 3中,所有前体不仅能够将月桂烯转化为顺式-1,4-聚Myrence,而且能够聚合MMA,从而形成具有中等间同立构规整度的聚(甲基丙烯酸甲酯)(PMMA)。侧链供体的引入同时提高了活性和稳定性,特别是在60-80°C时两种单体的聚合反应。在月桂烯顺式中观察到增强的活性和选择性含硫和氧的催化剂促进的-1,4聚合反应可能与弱的Co-X(X = O,S)相互作用有关,从而促进了月桂烯的配位。然而,供体对