Metal benz oylpivaloylmethanates, part I. Free ligands and copper(II) chelates

Abstract

Syntheses and properties of para-substituted benzoylpivaloylmethanes and their copper(II) chelates are described, i H n.m.r., u.v. and i.r. spectra of free ligands indicate a very high enol content. Molecular weight determinations showed that the bulky t-butyl and phenyl groups do not prevent association of chelates in chloroform solutions. All the chelates obey the Curie-Weiss law with the Weiss constant close to zero; magnetic moments lie within the 1.87-2.02 B.M. rangeover the 77 300Krange. l.r. and Raman spectra suggest that the complexes have a square planar stereochemistry and a trans geometrical structure.

Benzoylpivaloylmethanide Precursors for the Chemical Beam Epitaxy of Oxide Thin Films. 1. Synthesis, Characterization, and Use of Yttrium Benzoylpivaloylmethanide

“…The ligand benzoylpivaloylmethane (Hbpm) was first synthesized by Vorländer and Kalkow in 1898 . From UV, IR, and 1 H NMR spectroscopy − it was concluded that the diketone exists mainly as PhCOCH(OH)CMe 3 (Ph, phenyl; Me, methyl). Up to now, only benzoylpivaloylmethanide complexes with alkaline earth and transition metals have been described in the literature …”