1596366-66-3Relevant academic research and scientific papers
Rare-earth alkyl complexes supported by formamidinate ligands: Synthesis, structure, and catalytic activity for isoprene polymerization
Guo, Liping,Zhu, Xiancui,Zhou, Shuangliu,Mu, Xiaolong,Wei, Yun,Wang, Shaowu,Feng, Zhijun,Zhang, Guangchao,Deng, Baojia
, p. 6842 - 6847 (2014/05/06)
A series of rare-earth metal monoalkyl complexes supported by N,N′-di(2,6-dialkylphenyl)formamidinate ligand (L)2RECH 2SiMe3·thf [L1 = HC(N-2,6-Me 2C6H3)2, RE = Y (1), L2 = HC(N-2,6-iPr2C6H3)2, RE = Y (2), Er (3), Dy (4), Sm (5), and Nd (6)] were synthesized by alkyl elimination reaction or by salt metathesis reaction in good yields. All complexes were characterized by elemental analyses, FT-IR spectroscopy and single crystal X-ray diffraction. In combination with [Ph3C][B(C 6F5)4] and alkylaluminium, these complexes displayed a good activity towards isoprene polymerization to give polyisoprenes with high molecular weight (Mn > 104) and narrow molecular distribution (PDI 3C][B(C6F5)4] on the polymerization of isoprene was studied. It was interesting to find that addition of the cocatalysts sequence has a great influence on the regioselectivity of the polymerization. High 1,4-regioselectivity polymerizations of isoprene (as high as 98%) were observed when the catalysts were added in the order [RE]/[alkylaluminum]/[borate]. This journal is the Partner Organisations 2014.
