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The pseudotetrahedral structure of 4 in the crystal (Fig. shows that the phospholyl ligand is pentahapto bonded to the uranium atom. The ring geometry differs very little from that of related complexes of Li"] or Zr.C31 The short U-B distance (255 pm) is typical for bonds with a tridentate BH, ligand.L6'] Finally, we should emphasize that, [16] M. R.

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The title complexes (III) are obtained according to the scheme and characterized by elemental analysis, IR spectra, and X‐ray structure analysis (for both space group P21/c, Z=4).