Wydział Chemii

Marcin Górski

Andrzej Kochel

Teresa Szymańska-Buzar

2004

Organometallics

23

3037-3046

10.1021/om0400043

Naukowa

Angielski

Artykuł

Two new norbornene complexes of tungsten(0), W(CO)₅(η²-C₇H₁₀) (1) and trans-W(CO)₄(η²-C₇H₁₀)₂ (2), have been obtained and characterized by IR and NMR spectroscopy, and initial studies of their reactivity are reported here. The molecular structure of compound 1, relatively unstable in solution, was established by single-crystal X-ray diffraction studies. Complex 1 can, depending on reaction conditions, give rise to different types of reactions:  in a pure polychloromethane solution, it transforms to a species initiating the ring-opening metathesis polymerization of norbornene (ROMP), whereas in the presence of alcohol (ca. 1%), it leads to catalytic C−C bond formation with selective addition of polychloromethane to the olefinic bond of norbornene. The two-electron chemical oxidation of stable trans-W(CO)₄(η²-C₇H₁₀)₂ (2) by SnCl₄ gives a very labile norbornene complex of tungsten(II) (3). The latter compound decomposes in CDCl₃ solution to give chloronorbornane, whereas in benzene-d₆ or toluene-d₈ solution the products of the hydroarylation of norbornene are formed. The identities of the organometallic and organic products were established by IR, NMR, ESI-MS, and GC-MS studies.

Hydrocarbons, Ligands, Addition reactions, Tungsten, Nuclear magnetic resonance spectroscop

http://doi.org/10.1021/om0400043

https://www.acs.org/content/acs/en.html