different bis-guanidines based on 12 discrete monoguanidine units and seven different spacers. These spacers have been chosen such that the most important phenotypes have been dealt with and which range from rigid to more flexible scaffolds. In addition to spacers with no metal-binding capabilities, other species containing further donor functions such as N-methyldiphenyleneamine or pyridine-2,6-diyl have
Combing a phenanthrolinemoiety with twoperalkylatedguanidineresidues leads to a novel family of Janusheadpro-ligands with site-specific metal-differentiating properties. The ligands differ in the substitution pattern of their peralkylatedguanidine functionalities. They were characterized by X-ray crystallography, temperature-dependent 1H NMR spectroscopy and cyclic voltammetric techniques.
将菲咯啉部分与两个过烷基化的胍基残基组合在一起会形成具有位点特异性金属分化特性的Janus头原配体新家族。配体的过烷基化胍官能团的取代方式不同。通过X射线晶体学,温度依赖性1 H NMR光谱和循环伏安技术对其进行了表征。
Zinc Chloride Complexes with Aliphatic and Aromatic Guanidine Hybrid Ligands and Their Activity in the Ring‐Opening Polymerisation of
<scp>d,l</scp>
‐Lactide
The synthesis of the new hybrid guanidine ligands DMEGdmap, DMEGdeae, TMGdmab, DMEGdmab, TMGdeab and DMEGdeab is reported. These ligands were combined with zinc chloride, and the six obtained new complexes were structurally characterised by X-ray crystallography and NMR spectroscopy. Further six new zinc chloride complexes were obtained from the hybrid guanidine ligands TMGdmae, DMEGdmae, TMGdeae,
Zinc Complexes with Guanidine–Pyridine Hybrid Ligands – Guanidine Effect and Catalytic Activity
作者:Janna Börner、Ines dos Santos Vieira、Matthew D. Jones、Artjom Döring、Dirk Kuckling、Ulrich Flörke、Sonja Herres‐Pawlis
DOI:10.1002/ejic.201100540
日期:2011.10
series of guanidine–pyridineligands have been synthesised by the reaction of various chloroformamidinium chlorides with 8-aminoquinoline or 2-picolylamine. The ligands were treated with either zinc chloride or zinc acetate to prepare the corresponding complexes, which were tested as initiators in the solvent-free ring-opening polymerisation of d,l-lactide. The effect of the guanidine ligand on the catalytic
Pentaalkylmethylguanidinium methylcarbonates – versatile precursors for the preparation of halide-free and metal-free guanidinium-based ILs
作者:Benjamin Oelkers、Jörg Sundermeyer
DOI:10.1039/c0gc00698j
日期:——
methylcarbonates 6 can easily be prepared from pentaalkylguanidines 5 and dimethyl carbonate (DMC) in a sustainable solvent-free synthesis. Most of the title compounds are roomtemperatureionicliquids (RTILs) which provide convenientaccess to halide-free guanidinium-based ILs (GILs) 7via acid–base reactions and subsequent decarboxylation, similar to industrially important imidazolium methylcarbonates 1