Tetrakis pyrrolyl

The pyrrolyl ligand is interesting in that it can function as both a u-bonded amido group or a yr-bonded multihapto ligand. The pyrrolyl group appears to be a weaker electron donor than the cyclopentadienide anion 90). In the tetrakis-(2,5-dimethylp3u rolyl)uranium(IV) complex a preliminary structure has been revised with a tris(monohapto) (pentahapto) structure now assigned from variable temperature PMR spectra 90). 

The tetrakis(trifluoromethylthio)pyrrolyl radical replaces halogen in PX3 (X = Cl, Br, I). Monosubstitution is observed when stoichiometric amounts of the pyrrolle or its salts are reacted with PX3. 

Cl5H4 4CI3C0N6O4, (-)589 Tris-( + )-trans-l,2-diaminocyclopentane)cobalt (III) chloride tetrahydrate, 37B, 544 CleF2aHgN2S8, Bis[2,3,4,5-tetrakis(trifluoromethylthio)pyrrolyl]mer-cury, 45B, 1173... 

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