Synthesis of palladium complexes with anionic N,NR- or neutral NH,NR-theophylline-derived NHC ligands

被引：3

作者：

Jahnke, Mareike C. ^{[1
]}

Herve, Alexandre ^{[1
]}

Kampert, Florian ^{[1
]}

Hahn, F. Ekkehardt ^{[1
]}

机构：

[1] Westfalische Wilhelms Univ Munster, Inst Anorgan & Analyt Chem, Corrensstr 30, D-48149 Munster, Germany

来源：

INORGANICA CHIMICA ACTA | 2021年 / 515卷

关键词：

8-Halogenotheophyllines; Oxidative addition; Protic N-heterocyclic carbenes; Palladium; N-HETEROCYCLIC CARBENE; OXIDATIVE ADDITION; TEMPLATE SYNTHESIS; CRYSTAL-STRUCTURE; RUTHENIUM(II) COMPLEXES; AG-I; AU-I; BEARING; ACTIVATION; CATALYSIS;

D O I：

10.1016/j.ica.2020.120055

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Four C8-halogenated theophyllines (1-4) featuring N7-methyl or N7-allyl and C8-chloro or C8-bromo substituents have been prepared. The halogenotheophyllines react with [Pd(PPh3)(4)] in an oxidative addition to give complexes of type trans-[Pd(theophyllinato)X(PPh3)(2)] (trans-[5]-trans-[8]). The protonation of the unsubstituted theophyllinato ring-nitrogen atom to give the pNHC complexes was achieved either by performing the oxidative addition of 1 in the presence of NH4BF4 to give complex trans-[9]BF4 or by N-protonation of the coordinated theophyllinato ligand in trans-[6]-trans-[8] with HBF4Et2O to give complexes trans-[10]BF4-trans[12]BF4. The molecular structures of trans-[5], trans-[7], trans-[9]BF4, trans-[11]BF4 and trans-[12]BF4 were determined by X-ray diffraction showing significant differences of comparable metric parameters in the theophylline-derived five-membered diaminoheterocycles. No interaction of the N-allyl substituents with the metal center was observed.

引用

页数：8

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