Synthesis of Sterically Demanding Bis(phosphinimine) Dibenzofuran Ligands and Subsequent Zinc Metalation*
Matthew T. Zamora A , Saif M. Zahir A , Kevin R. D. Johnson A , Clay J. Barnson A , Craig A. Wheaton A , Mikko M. Hänninen A and Paul G. Hayes A B
+ Author Affiliations
- Author Affiliations
A Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive, Lethbridge, AB, T1K 3M4, Canada.
B Corresponding author. Email: p.hayes@uleth.ca
Australian Journal of Chemistry 68(3) 373-384 https://doi.org/10.1071/CH14577
Submitted: 19 September 2014 Accepted: 9 October 2014 Published: 2 December 2014
Abstract
In light of previous success surrounding the use of bis(phosphinimine)dibenzofuran ligands for zinc-mediated lactide polymerization, a series of sterically demanding P=N pincer compounds have been prepared with important steric and electronic modifications at both P- and N-sites (L, 3a–d). These systems are highly crystalline and have been extensively characterized using multinuclear NMR spectroscopy, elemental analysis, and X-ray diffraction. The ligands can be transformed into their protonated analogues [HL][BArF4] (4a–d, [BArF4] = [B(m-(CF3)2-C6H3)4]) by reaction with Brookhart’s acid, and subsequently coordinated to zinc via an alkane elimination reaction with [ZnEt2] at ambient temperature to afford the corresponding [LZnEt][BArF4] cationic complexes 5a–d. In addition, an unusual chloridozinc species [LZnCl][BArF4] (5c′) has been isolated and structurally characterized, providing comparisons to previously established ligand sets with similar geometries.
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