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Environmentally Friendly Approach: Synthesis and Biological Evaluation of α-Aminophosphonate Derivatives
Published in Satish A. Dake, Ravindra S. Shinde, Suresh C. Ameta, A. K. Haghi, Green Chemistry and Sustainable Technology, 2020
Fang’s approach [62] was prepared a biodegradable SO3H-functionalized IL and used as the catalyst for the synthesis of α-aminophosphonates from aldehydes, amines, and triethylphosphite/diethylphosphite at RT under solvent-free conditions or in aqueous media. The products could be simply separated from the reaction mixture and the catalyst could be recycled and reused for several times without noticeably reducing catalytic activity (Scheme 5.23).
Pentamethylcyclopentadienyl iron thiocarboxylato complexes: synthetic and characterization study
Published in Journal of Sulfur Chemistry, 2022
Mohammad El-khateeb, Sammer Yousuf, Rajesh Kumar
Half-sandwich cyclopentadienyldicarbonyl iron complexes of sulfur ligands are investigated in our laboratory. Complexes such as thiocarboxylates CpFe(CO)2SCOR [11–13], thiosulfonates CpFe(CO)2SSO2R [14,15], thiooxalates CpFe(CO)2SCOCO2R [16], thiocarbonates CpFe(CO)2SCO2R [17], O-alkyl dithiocarbonates CpFe(CO)2SC(S)OR [18] S-alkyl dithiocarbonates CpFe(CO)2SC(O)SR [19] and trithiocarbontes CpFe(CO)2SCS2R [20], have been reported from the treatment of the iron sulfides (μ-Sx)[CpFe(CO)2]2 (x = 2–4) with the corresponding organic chlorides [11–20]. The analogous mono- or di-tert-butylcyclopentadienyl thiocarboxylates Cp'Fe(CO)2SCOR (Cp’ = C5H4tBu, 1,3-C5H3(tBu)2) were also synthesized by the reactions of (μ-Sx)[Cp'Fe(CO)2]2 with chloride acids [21]. The dicarbonyl thiocarboxylato complexes underwent CO-substitution by EPh3 ligands for E = P, As, Sb or triethylphosphite under photolytic conditions to form the mixed ligand complexes Cp'Fe(CO)(EPh3)SCOR or Cp'Fe(CO)(P(OEt)3)SCOR [11,22].
Mesoporous titania–ceria mixed oxide (MTCMO): a highly efficient and reusable heterogeneous nanocatalyst for one-pot synthesis of β-phosphonomalonates via a cascade Knoevenagel–phospha-Michael addition reaction
Published in Journal of Experimental Nanoscience, 2020
Mohammed Salim Mohammed, Mohsen Bakhtiarian, Kiumars Bahrami
In the next step, the effect of solvent, temperature and amount of catalyst was studied (Table 3). First, equivalent reactions were performed with 2 mol% of the catalyst in the various solvents as well as solvent-free conditions at 50 °C. As shown, the reaction proceeded with better yield in ethanol as compared to the other solvents (Table 3, entries 1–6). By increasing the amount of the catalyst to 3 mol% an improvement in the yield of product was observed (Table 3, entry 7), and by increasing the temperature to 60 °C the best result was obtained (Table 3, entry 8). Therefore, the optimum condition was determined as a reaction with 3 mol% of MTCMO, 1 mmol of aldehyde, 1 mmol of malonitrile and 1 mmol of triethylphosphite in the 5 mL of ethanol at 60 °C.