Synthesis and Characterization of 2-Chloro-4-Fluorobenzyl-Substituted Benzimidazolium Salts


Bal S., Gök Y. , Aktaş A.

3st International Conference on Physical Chemistry & Functional Materials (PCFM20), Malatya, Türkiye, 22 - 24 Eylül 2020, ss.22

  • Basıldığı Şehir: Malatya
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.22

Özet

Carbenes are described as neutral compounds of bivalent carbon in which the carbon atom has only six valence electrons. For nearly 150 years, the carbene chemistry has gained value among in the chemists [1, 2]. Until the beginning of 1968, the synthesis of unsaturated imidazol-2-ylidene metal complexes was known. However, despite all the efforts, until 1991 a stable N-heterocyclic carbene could not be isolated. Arduengo et al. were synthesized the first free and stable "inflatable" N-heterocyclic carbene (I) by deprotonation of the imidazolium salt  in 1991 [3]. Since, the stable NHCs were synthesized and, in the organic and organometallic chemistry appeared very important developments. These stable compounds have attracted great interest by chemists [4, 5] due to their strong σ-bonding and poor π-bonding, air and moisture stability and regulation.

Our study contains the synthesis of novel a serie synthesis of NHC precursors that 2-chloro-4-fluorobenzyl substituted. The NHC precursors have been prepared from 1- alkyl/arylbenzimidazole and 2-chloro-4-fluorobenzyl chloride. The novel NHC precursors have been characterized by using 1H NMR, 13C NMR, FTIR spectroscopy and elemental analysis techniques.