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Novel pyridinium based cobalt carbonyl ionic liquids: synthesis, full characterization, crystal structure and application in catalysis

“…All the 1 H and 13 C NMR chemical shifts of compounds 2 were consistent with those of their corresponding halide precursors (1a-1c), 34, 35 indicating no major change in the chemical structure of the cationic part of the compounds, in other words, confirming the cationic part of the compounds to be the expected structure ([C n Py] + ). The interionic hydrogen bond also has a detectable effect on the 1 H NMR spectra, i.e.…”

“…1 H NMR and 13 C-NMR spectra were measured on a Varian INOVA 400 M spectrometer. UV-Vis absorption spectra were recorded at ambient temperature using an HP 8453 UV-Vis spectrophotometer.…”

Cobalt carbonyl ionic liquids based on the 1,1,3,3-tetra-alkylguanidine cation: Novel, highly efficient, and reusable catalysts for the carbonylation of epoxides

“…The conversion of PO and yield of ethyl 3-hydroxybutyrate increased with increasing CO pressure and changed slightly when the CO pressure was greater than 5 MPa (Table 3, entries 12 and 14-16). In addition, the effect of time on this reaction should not be underestimated (Table 3, entries [16][17][18]. The conversion of PO and yield of ethyl 3-hydroxybutyrate increased with increasing time.…”

“…Recently, among the vast research related to ILs, organometallic ILs [8][9][10][11][12] based on transition metals have received increasing attention, especially in catalysis [5,13], because of their potential catalytic activity and considerable reusability [11,14]. Notably, Co(CO)4  as a widely used catalytic active species has been used in organometallic ILs [11,[15][16][17][18][19][20][21] [11,[22][23][24][25][26]. According to the previous reports, [CnPy][Co(CO)4] and [bmim][Co(CO)4] organometallic ILs have been applied in the carbonylation of epoxides.…”