Two Cationic Copper(I) Catalysts with N-Donor Ligands for the Polymerization of Methyl Methacrylate

✍ Scribed by Guang-Fei Liu; Ling-Ling Li; Zhi-Gang Ren; Hong-Xi Li; Zhen-Ping Cheng; Jian Zhu; Xiu-Lin Zhu; Jian-Ping Lang

• Book ID: 102487672
• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 299 KB
• Volume: 210
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200900216

✦ Synopsis

Abstract

Two new copper(I) complexes, Cu(bdmpm)~2~ (1) [bis(3,5‐dimethyl‐1__H__‐pyrazol‐1‐yl)methane (bdmpm)] and [Cu(µ‐bdmpp)(MeCN)]~2~(PF~6~)~2~ (2) [2,6‐bis(3,5‐dimethyl‐1__H__‐pyrazol‐1‐yl)pyridine (bdmpp)], were prepared by reactions of Cu(MeCN)~4~ with bdmpm or bdmpp in MeCN. X‐ray analysis revealed that 1 is a mononuclear complex with the central Cu being chelated by two bdmpm ligands. 2 has a double‐stranded helicate structure in which each of the two [Cu(µ‐bdmpp)(MeCN)]^+^ cations is linked by the other bdmpp ligand. Both 1 and 2 exhibited high catalytic activity in the polymerization of methyl methacrylate (MMA). Even though the ratio of MMA to catalyst was raised up to 1 000:1, the PDI for 1 (reaction time was fixed at 5 h) is below 1.6 and the conversion is up to 66.0% while that for 2 (reaction time was fixed at 6 h) is below 1.5 and the conversion is up to 75.2%. In addition, the effects of solvents, reaction temperatures as well as ratios of MMA to catalyst were also investigated.

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