Synthesis And Properties Of Fluorophenyl Carbonyl Cobalt(Ⅰ) Compounds

C-H bonds widely exist in variety of organic complexes. It could improve the efficiency and atom economy of the organic synthesis process when the C-H bonds are cut off directly and transformed to other functional groups under certain conditions. Transition metal complexes have incomparable advantages in C-H bonds activation and functionalization. C-H bonds in aldehydes are easy to react with metal compounds because of they are more active relatively. And there maybe occur the selective activation of C-H bonds and C-F bonds due to they exist in the same reagent. Researches on the C-H bonds activation currently concentrate on the precious metals compounds like Ru, Rh, Pd, Ir, Compared with them, cobalt compounds have the characteristic that unexpensive and environmental friendly.This paper is mainly divided into the following four parts:the first part is the synthesis of fluorophenyl carbonyl cobalt complexes 1-3 by C-H bonds activation using fluorobenzaldehydes reacted with CoMe(PMe3)4. The structure of compounds 1-3 were characterized by IR and NMR. Furthermore, compound 1 and 2 were determined by X-Ray single crystal diffraction. More properties about these fluorophenyl carbonyl cobalt complexes were carried out in the second part, to afford a dicarbonyl cobalt compound 4 and a bromo-cobalt complex 5 when the fluorophenyl carbonyl cobalt complexes were reacted with CO, pentafluorobromobenzene and phenylethyne. In the third part, CoMe(PMe3)4 was regarded as catalyst to convert 2,4,5-trifluoro-benzaldehyde to 1,2,4-trifluoro-benzene when silane as the hydrogen source. However, this catalytic reaction could not apply to other substrates, it need be optimized.In the last part, we tried to use CoMe(PMe3)4 to explore the C-H bond activation of different kinds of cinnamaldehydes and speculated the mechanism.