Dehydration of lanthanide halides hydrates: Crystal structure of [Ce(μ-Cl)3(THF)(H2O)]∞: A bidimensional meshlike polymer

A convenient and eco-friendly cerium(III) chloride-catalysed synthesis of methoxime derivatives of aromatic aldehydes and ketones

“…Probably, this is owing to the better solubility of all the reactants in alcoholic solvents and to their potential interaction with the promoter. Interestingly, it was shown that CeCl 3 forms a dimeric adduct with MeOH, [Ce 2 Cl 6 (MeOH) 8 ] that persists in solution and the corresponding ethanol adduct can also be prepared [ 58 , 59 ].…”

A convenient and eco-friendly cerium(III) chloride-catalysed synthesis of methoxime derivatives of aromatic aldehydes and ketones

“…Probably, this is owing to the better solubility of all the reactants in alcoholic solvents and to their potential interaction with the promoter. Interestingly, it was shown that CeCl 3 forms a dimeric adduct with MeOH, [Ce 2 Cl 6 (MeOH) 8 ] that persists in solution and the corresponding ethanol adduct can also be prepared [ 58 , 59 ].…”

Investigation into the Allylation Reactions of Aldehydes Promoted by the CeCl3·7H2O−NaI System as a Lewis Acid

“…The process was studied using allyltributylstannane in a 0.1 M solution of CDCl 3 . The addition of CeCl 3 to this solution at −78 °C resulted in 13 C NMR signals very broad, and not readily identifiable species could be discerned from the spectra, due, very probably, to the presence of paramagnetic Ce(III) species. 8b, However, signals for the starting material remained, and no change in the 13 C NMR spectra was observed when the CeCl 3 was added at −78 °C, the mixture was placed in the spectrometer, and spectra were observed at 30 °C intervals (approximatevely every 1/2 hour). Even after 1 day at room temperature there was no transmetalation of the allyltributylstannane.…”

Reversed Stereochemical Control in the Presence of CeCl3and TiCl4in the Lewis Acid Mediated Reduction of α-Alkyl-β-keto Esters by Metal Hydrides. A General Methodology for the Diastereoselective Synthesis ofsyn- andanti-α-Alkyl-β-hydroxy Esters

“…While the reducing system BH 3 ·py was highly efficient with TiCl 4 , no reaction with CeCl 3 was observed, and at −78 °C the starting material was quantitatively recovered after 2 h. Prolonged reaction times and higher reaction temperatures were also ineffective. A complex between cerium(III) chloride and β-keto ester was formed, since the addition of the substrate to a suspension of the cerous salt resulted in a clear solution after about 1 h. Unfortunately, the paramagnetism of cerous salt prevented useful NMR information on the structure of this complex from being obtained …”

A convenient and eco-friendly cerium(III) chloride-catalysed synthesis of methoxime derivatives of aromatic aldehydes and ketones

“…Probably, this is owing to the better solubility of all the reactants in alcoholic solvents and to their potential interaction with the promoter. Interestingly, it was shown that CeCl 3 forms a dimeric adduct with MeOH, [Ce 2 Cl 6 (MeOH) 8 ] that persists in solution and the corresponding ethanol adduct can also be prepared [ 58 , 59 ].…”

Investigation into the Allylation Reactions of Aldehydes Promoted by the CeCl3·7H2O−NaI System as a Lewis Acid

“…The process was studied using allyltributylstannane in a 0.1 M solution of CDCl 3 . The addition of CeCl 3 to this solution at −78 °C resulted in 13 C NMR signals very broad, and not readily identifiable species could be discerned from the spectra, due, very probably, to the presence of paramagnetic Ce(III) species. 8b, However, signals for the starting material remained, and no change in the 13 C NMR spectra was observed when the CeCl 3 was added at −78 °C, the mixture was placed in the spectrometer, and spectra were observed at 30 °C intervals (approximatevely every 1/2 hour). Even after 1 day at room temperature there was no transmetalation of the allyltributylstannane.…”

Reversed Stereochemical Control in the Presence of CeCl3and TiCl4in the Lewis Acid Mediated Reduction of α-Alkyl-β-keto Esters by Metal Hydrides. A General Methodology for the Diastereoselective Synthesis ofsyn- andanti-α-Alkyl-β-hydroxy Esters

“…While the reducing system BH 3 ·py was highly efficient with TiCl 4 , no reaction with CeCl 3 was observed, and at −78 °C the starting material was quantitatively recovered after 2 h. Prolonged reaction times and higher reaction temperatures were also ineffective. A complex between cerium(III) chloride and β-keto ester was formed, since the addition of the substrate to a suspension of the cerous salt resulted in a clear solution after about 1 h. Unfortunately, the paramagnetism of cerous salt prevented useful NMR information on the structure of this complex from being obtained …”

A convenient and eco-friendly cerium(III) chloride-catalysed synthesis of methoxime derivatives of aromatic aldehydes and ketones

“…Probably, this is owing to the better solubility of all the reactants in alcoholic solvents and to their potential interaction with the promoter. Interestingly, it was shown that CeCl 3 forms a dimeric adduct with MeOH, [Ce 2 Cl 6 (MeOH) 8 ] that persists in solution and the corresponding ethanol adduct can also be prepared [ 58 , 59 ].…”

Investigation into the Allylation Reactions of Aldehydes Promoted by the CeCl3·7H2O−NaI System as a Lewis Acid

“…The process was studied using allyltributylstannane in a 0.1 M solution of CDCl 3 . The addition of CeCl 3 to this solution at −78 °C resulted in 13 C NMR signals very broad, and not readily identifiable species could be discerned from the spectra, due, very probably, to the presence of paramagnetic Ce(III) species. 8b, However, signals for the starting material remained, and no change in the 13 C NMR spectra was observed when the CeCl 3 was added at −78 °C, the mixture was placed in the spectrometer, and spectra were observed at 30 °C intervals (approximatevely every 1/2 hour). Even after 1 day at room temperature there was no transmetalation of the allyltributylstannane.…”

Reversed Stereochemical Control in the Presence of CeCl3and TiCl4in the Lewis Acid Mediated Reduction of α-Alkyl-β-keto Esters by Metal Hydrides. A General Methodology for the Diastereoselective Synthesis ofsyn- andanti-α-Alkyl-β-hydroxy Esters

“…While the reducing system BH 3 ·py was highly efficient with TiCl 4 , no reaction with CeCl 3 was observed, and at −78 °C the starting material was quantitatively recovered after 2 h. Prolonged reaction times and higher reaction temperatures were also ineffective. A complex between cerium(III) chloride and β-keto ester was formed, since the addition of the substrate to a suspension of the cerous salt resulted in a clear solution after about 1 h. Unfortunately, the paramagnetism of cerous salt prevented useful NMR information on the structure of this complex from being obtained …”