Improved Synthesis of Unsymmetrical N-Aryl-N′-alkylpyridyl ß-Diketimines Using Molecular Sieves and their Lithium Complexes

Kuldeep Chand, Cheng Long Tsai, Hsuan Ying Chen, Wei Min Ching, Sung Po Hsu, James R. Carey, Sodio C.N. Hsu

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2 Citations (Scopus)


The synthesis of unsymmetrical β-diketimines with N-aryl-N′-alkyl substitution require at least two condensation steps and tedious purification procedures. An improvement in the preparation of four unsymmetrical N-aryl-N′-alkylpyridyl β-diketimine ligands (HL1–HL4) using 5-Å molecular sieves is reported. The synthesis of four Li complexes (LiL1, LiL2, LiL3, and LiL4) containing N-aryl-N′-alkylpyridyl β-diketimines ligands is also presented. All four Li complexes were fully characterized by 1H NMR spectroscopic, 13C NMR spectroscopic, and elemental analyses. X-ray structure analysis and spectroscopic results indicate that the Li β-diketimine structures and ligand binding modes are governed by the bulkiness of the N-aryl substituent and the length of the pyridyl arm of the N-aryl-N′-alkyl β-diketiminate ligand.

Original languageEnglish
Pages (from-to)1093-1098
Number of pages6
JournalEuropean Journal of Inorganic Chemistry
Issue number9
Publication statusPublished - Mar 7 2018



  • Acetylacetone
  • Chelates
  • Lithium
  • X-ray diffraction
  • β-Diketiminate ligand

ASJC Scopus subject areas

  • Inorganic Chemistry

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