Rearrangements of =C=N- Functionalities promoted by Cobalt(I): Reactivity of Cyclopentadienylbis(ethylene)cobalt(I) with Dibenzophenone Azine, Benzophenone Oxime, Benzylidene(phenyl)amine and Crystal Structure Determination of the Products

Article abstract of DOI:10.1039/DT9890001957

The reaction of (1) with various =C=N- organic functionalities was explored.The results are very different depending on the substituents at the imino group.Dibenzophenone azine, Ph2C=N-N=CPh2, oxidatively adds to (1) forming a diamagnetic binuclear cobalt(II) complex <2(μ-Ph2C=N)2> (2) .The reaction of (1) with benzophenone oxime, Ph2C=NOH, led, via a preliminary oxidative addition of the O-H bond to the metal, to the formation of a non-symmetric binuclear cobalt(II) complex <2(μ-Ph2C=N)-(μ-Ph2C=NO)> (3) .Benzylidene(phenyl)amine, PhCH=NPh, undergoes a sort of ortho-metallation reaction with (1), the resulting metallacycle functioning as a ligand for a second unit.The binuclear complex <2(μ-PhNCH2C6H4)> (4) is formed.Compounds (2)-(4) were characterized by single-crystal X-ray analysis: (2), space group Fdd2, a=18.346(3), b=39.348(7), c=8.359(2) Angstroem, Z=8, R=0.046 for 1463 independent observed reflections; (3), space group P2₁/c, a=10.009(1), b=30.433(3), c=10.344(1) Angstroem, β=108.93(1)degree, Z=4, R=0.041 for 2 274 independent observed reflections; (4), space group P2₁/n, a=9.674(1), b=8.512(1), c=22.741(3) Angstroem, β=95.90(1)degree, Z=4, R=0.040 for 1 845 independent observed reflections.

Full text of DOI:10.1039/DT9890001957

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