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Chemical Synthesis with Metal Atoms. The Preparation and Structure of Cyclo-octadiene Trifluorophosphine Complexes of Chromium. The Crystal Structure of (η5-Cyclo-octa-1,3-dienyl)hydridotris(trifluorophosphine)chromium

DOI: 10.1039/DT9810000661

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 661 - 667 (1981)

Update date:2022-08-02

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Authors:

Blackborow, J. RichardBlackborow, J. Richard

Eady, Colin R.Eady, Colin R.

Grevels, Friedrich-WilhelmGrevels, Friedrich-Wilhelm

Gustorf, Ernst A. Koerner vonGustorf, Ernst A. Koerner von

Scrivanti, AlbertoScrivanti, Alberto

Wolfbeis, Otto S.Wolfbeis, Otto S.

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Article abstract of DOI:10.1039/DT9810000661

The reaction of cyclo-octa-1,5-diene (1,5-cod), PF3, and chromium atoms produces (1) and (2).The use of 1,3- rather than 1,5-cod produces only (2) under the same conditions.Complex (1) is readily converted into (2) by heating (90 deg C, in toluene).The preparation of (3) from 1,3- or 1,5-cod is also described.The structure of (2) was determined by X-ray crystallography.The compound crystallizes in the orthorhombic space group Pbca with a=13.452(3), b=14.419(4), c=15.268(3) Angstroem, and Z=8.The final R value was 0.065 9 for 1 699 observed reflections. The structure is retained in solution below - 80 deg C, but is shown by 13C and 1H n.m.r. spectroscopy to become fluxional upon warming.There are two distinct exchange processes; one results in pairwise coalescence of the 13C and 1H resonances; the other finally leads to a set of only two 1H signals with an intensity ratio of 8:4, thus indicating equivalence of the eight ring positions.

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Product name:(η5-cyclo-octa-1,3-dienyl)hydridotris(trifluorophosphine)chromium

Cas No:56687-32-2

56687-32-2

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