51876-05-2Relevant academic research and scientific papers
Selective cation binding with cis,cis-1,3,5-trioxycyclohexyl based ligands: application to ion transport and electrochemical detection and assessment of complexation by electrospray mass spectrometry
Goodall, Matthew,Kelly, Patricia M.,Parker, David,Gloe, Karsten,Stephan, Holger
, p. 59 - 70 (2007/10/03)
The synthesis is reported of two sets of oxa-amide ionophores based on 2-phenylglycerol and cis,cis-cyclohexane-1,3,5-triol, with ligand coordination numbers of four, five and six.Ionophores based on the hexadentate cyclohexyl triamide 9 show excellent Na+/K+ selectivity (-logKpotNa,K=3.1), and the pentadentate analogue 10 shows good L+/Na+ selectivity (-logKpotLi,Na=2.2).Solution NMR and liquid-liquid extraction studied confirmed the formation of 1:1 complexes and IR studies pinpointed the presence of amide binding.Ligands based on 2-phenylglycerol exhibited good Ca2+ selectivity which was highest for the hexadentate triamide, 6.Detailed ESMS studies revealed similar trends in ion-binding, performed under controlled conditions.
Novel Transformations of 1,2-Dioxetanes: β-Hydroxy Ethers by Addition of Alkyllithium Reagents
Adam, Waldemar,Heil, Markus
, p. 235 - 241 (2007/10/02)
The reaction of 1,2-dioxetanes with alkyllithium reagents was investigated.The 3,3-disubstituted dioxetanes 2a,d and their halogen-substituted analogues 2b,c, which were used as probes to differentiate between the mechanistic alternatives (SN2 reactivity vs. single-electron transfer), reacted with n-BuLi to afford the β-hydroxy ethers 3a-d.Additionally, the epoxide 4 was obtained from dioxetanes 2b,c.The epoxide 5 and a small amount of acetophenone were found in the reaction of dioxetane 2c with triphenylmethyllithium, but only the minor part of the dioxetane-derived products could be identified.The observation of the epoxides 4 and 5 led to the mechanistic conclusion that nucleophilic attack (SN2 reactivity) is the most prominent process in this reaction.Key Words: Dioxetanes / Single electron transfer vs. nucleophilic attack / Ethers, β-hydroxy / Alkyllithium reagents
