Imine Dertivatives of Lantranons- Part II: Synthesis and Characterizatio of Xexa-Coordinated Xstamine and Aldimine Derivatives of Reodymium (III)

Abstract

Bifunctional tetradentate ketamines and aldimines derived from the condensation of pentane-2,4-dione, o-hydroxy acetophenone, salicylaldehyde or 2-hydroxy-1-naphthaldehyde with 1,2-propylenedismine and 1,3-propylenediamine react with neodymium isopropoxide in anhydrous benzene liberating differing amounts of moles of isopropanol depending on the stoichiometry of the reaction and yield a variety of derivatives which have been characterized by I.R., ¹H NMR and electronic spectral studies. The nonoisopropoxy neodymium derivatives are highly hydrolyzable in the open atmosphere due to the presence of the isopropoxy Groups and are dimeric in boiling chloroform. On the other hand, the 2:3 and 1:2 (M:L) derivatives are stable in the open atmosphere and monomeric in nature. The labile nature of the isopropoxy groups in 1:1 derivatives is shown by carrying out exchange reactions with an excess of t-butylalcohol.