FURFUROXIDES OF LANTHANUM, PRASEODYMIUM, NEODYMIUM, AND SAMARIUM

Ln(R)3, Ln(R)2(OPri), and Ln(R)(OPri)2 (where Ln = La, Pr, Nd, and Sm; R = deprotonated furfuryl alcohol, RH) were prepared from lanthanide isopropoxide and furfuryl alcohol in 1:3, 1:2 and 1:1 stoichiometric ratios respectively in anhydrous benzene under reflux. Ln(R)2-(OPri) and Ln(R)(OPri)2 were also obtained at room temperature. The isopropoxy group(s) of these derivatives were replaced by tertiary butoxy group(s) during the alcohol exchange reactions with tertiary butanol. All these derivatives are soluble in benzene except the tertiary butoxy derivatives which are only sparingly soluble. However, they become insoluble on standing. These furfuroxides did not distil at ∼300°C/102 torr but decomposed. Isopropoxy/butoxy furfuroxides were characterized by the elemental analysis and also by estimating the liberated isopropanol. The i.r. spectra of Ln(R)3 clearly supports the presence of furfuroxide groups in these derivatives. Furfuroxide von Lanthan, Praseodym, Neodym und Samarium Ln(R)3, Ln(R)2(OPri)2 und Ln(R)(OPri)2 (Ln = La, Pr, Nd bzw. Sm; R = deprotonierter Furfurolalkohol, RH) wurden aus den Isopropoxiden der Lanthaniden durch Umsetzung mit Furfurylalkohol im Verhaltnis 1:3, 1:2 bzw. 1:1 in Benzol dargestellt. Die Isopropoxigruppen dieser Verbindungen konnen durch Umsetzung mit t-Butanol gegen t-Butoxigruppen ausgetauscht werden Die Eigenschaften der Verbindungen werden beschrieben.