CONTINUING our structural studies of a-aryl complexes of the transition metals,l we have undertaken an X-ray study of n-cyclopentadienyltricarbonyl-a-phenyltungsten, (n-C5H5)W(C0),(o-C,H,) (I), prepared by reaction of diphenyliodonium fluoroborate with (n-C,H,) W(C0) ,Na, and characterised by its lH n.m.r. spectrum.2 To our knowledge, (I) is the first reported a-aryl derivative of a Group VI transition metal.
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