Synthesis, structures, and norbornene polymerization behavior of palladium methyl complexes bearing N-heterocyclic carbene-sulfonate ligands

LI Minliang; WANG Baiquan

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Synthesis, structures, and norbornene polymerization behavior of palladium methyl complexes bearing N-heterocyclic carbene-sulfonate ligands

LI Minliang,WANG Baiquan * #

College of Chemistry, Nankai University, Tianjin 300071

*Correspondence author

#Submitted by

Subject:

Funding: NSFC （No.21174068, 21421062）, SRFDP（No.20110031110009）

Opened online:21 December 2015

Accepted by: none

Citation: LI Minliang,WANG Baiquan.Synthesis, structures, and norbornene polymerization behavior of palladium methyl complexes bearing N-heterocyclic carbene-sulfonate ligands[OL]. [21 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4670742

A series of N-heterocyclic carbene-sulfonate (NHC-sulfonate) palladium methyl complexes 2a-d were synthesized from the reaction of NHC-sulfonate ligands with Ag2O and Pd2(μ-Cl)2Me2(2,6-lutidine)2 in good yields. All these complexes were fully characterized by 1H and 13C NMR, elemental analysis, and high-resolution mass spectrometry (HRMS). The molecular structure of the representative complex 2a was also determined by single-crystal X-ray diffraction analysis. Upon activation with either methylaluminoxane (MAO) or [Ph3C]+[B(C6F5)4]-, all the palladium methyl complexes showed excellent catalytic activities [up to 108 g of polynorbornene (PNB) (mol of Pd)-1 h-1] in the vinyl polymerization of norbornene.

Keywords:Polymerization catalyst; Palladium; N-Heterocyclic carbene; Norbornene

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