The author of 《Synthesis and characterization of analogues of glycine-betaine ionic liquids and their use in the formation of aqueous biphasic systems》 were Pereira, Matheus M.; Pedro, Sonia N.; Gomes, Joana; Sintra, Tania E.; Ventura, Sonia P. M.; Coutinho, Joao A. P.; Freire, Mara G.; Mohamadou, Aminou. And the article was published in Fluid Phase Equilibria in 2019. Product Details of 2969-81-5 The author mentioned the following in the article:
A series of novel analogs of glycine-betaine ionic liquids (AGB-ILs), viz. 1-(4-ethoxy-4-oxobutyl)-1-methylpyrrolidin-1-ium, N,N,N-tri(n-butyl)(4-ethoxy-4-oxobutyl)-1-phosphonium and N,N,N-trialkyl(4-ethoxy-4-oxobutyl)-1-aminium cations with Et, Pr and Bu alkyl chains, combined with the bromide anion, have been synthesized and characterized. Their synthesis and characterization by spectroscopic methods and elemental anal. is here reported. These ILs were further characterized in what concerns their thermal properties and ecotoxicity against Allvibrio fischeri, and compared with the com. tetra(n-butyl)ammonium and tetra(n-butyl)phosphonium bromide. The novel AGB-ILs described in this work have low m.ps., below 100°C, display high degradation temperatures (180-310°C), and low toxicity as shown by being harmless or practically harmless towards the marine bacteria Allvibrio fischeri. Finally, the ability of the synthesized AGB-ILs to form aqueous biphasic systems with potassium citrate/citric acid (at pH 7) was evaluated, and the resp. ternary phase diagrams were determined It is shown that the increase of the cation alkyl chain length facilitates the creation of ABS, and that phosphonium-based ILs present a slightly better separation performance in presence of aqueous solutions of the citrate-based salt. In the experiment, the researchers used Ethyl 4-bromobutyrate(cas: 2969-81-5Product Details of 2969-81-5)
Ethyl 4-bromobutyrate(cas: 2969-81-5) belongs to bromides. A variety of minor organobromine compounds are found in nature, but none are biosynthesized or required by mammals. Organobromine compounds have fallen under increased scrutiny for their environmental impact.Product Details of 2969-81-5
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary