Aim and Objective:
The late transition metal complexes with five-membered heterocyclic
mono-imine ligands have attracted much attention because of their potential application in olefin polymerization
catalysis. In order to increase the coordination ability of heteroatom N and S to center metals, CH3 group
was introduced into the side arm of pyrrole imine and thiophene imine respectively, to get two series of novel
five-membered heterocyclic imine compounds, mono(imino)pyrroles and mono(imino)thiophenes
Materials and Methods:
Two series of novel five-membered heterocyclic compounds with the mono-imine
group were synthesized from the p-toluene sulfonic acid catalyzed Schiff base condensation of aromatic
amines and 2-acetylpyrrole/ 2-acetylthiophene respectively, using CH3 group to substitute the common H atom
on the side arm of pyrrole imine/ thiophene imine.
Results:
All the heterocyclic mono-imine compounds were characterized adequately by means of 1H NMR, 13C
NMR, FT-IR, elementary analysis, as well as X-ray crystallographic diffraction. The reactivity differences
between two precursor 2-acetylpyrrole and 2-acetylthiophene with aromatic amines were compared and
discussed in detail.
Conclusion:
Compared to traditional heating methods, the solvent-free microwave irradiation seemed more
efficient to prepare these series of five-membered heterocyclic mono-imine compounds, which resulted in a
higher yield and cleaner product.
The Use of the Test for Oral Muscular Coordination Ability to Increase the Level of Adaptive Capacity of Oral Cavity Organs to Prosthodontic Treatment of Patients with Completely Absent Dentition