Solvent purification ethylenediamine

Methylacrylate and ethylenediamine were obtained from the Merck. Jeffamine T-3000 was purchased from Texaco Chemical Company. Other chemicals were used as obtained from the Fluka without further purification unless otherwise noted. Solvents were dried and distilled according to literature procedures prior to use. Reactions were controlled by thin layer chromatography (TLC) on silica gel 60 F254 and spots were detected either by UV-visible light or by charging with vapor. 

All solutions were prepared from reagent grade chemicals and solvents without further purification. Two of the new ligands which were tested for the Pfeiffer effect, 2-(2-pyridyl)-benzimidazoline and 2-(2-pyridyl)-imidazoline, were prepared by the method of Walter and Freiser 18). The other ligand which had to be synthesized, (ethanediylidenetetra-thio)tetraacetate (ETTA), was prepared by the method of Longo et al. 12). Tris(ethylenediamine)nickel(II) chloride was prepared by the method of State 17). Bis(salicylidene)triethylenetetramine alumi-num(III) iodide [A1(TS2)]I was prepared by the method of Das Sarma and Bailar 6). 

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