title: Tris(pyrrolyl-alpha-methyl)amines that sterically protect a trigonal metal site.
abstract: Three substituted tris(pyrrolyl-alpha-methyl)amines (H(3)[Aryl(3)TPA]) (Aryl = 2,4,6-C(6)H(2)Me(3), 2,4,6-C(6)H(2)(i-Pr)(3) (Trip), or 3,5-C(6)H(3)(CF(3))(2)) have been prepared. An X-ray study of [Trip(3)TPA]MoCl shows it to be a distorted trigonal bipyramidal species in which the 2,4,6-triisopropylphenyl substituents surround and protect the apical chloride. Attempts to prepare other Mo, Zr, and Hf complexes yielded species in which one pyrrole-containing arm remained free (Mo) or dimethylamine remained in the coordination sphere of [Aryl(3)TPA](3-) complexes (Zr, Hf).
authors.affiliation: Department of Chemistry 6-331, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Keith M
authors.initials: KM
authors.lastname: Wampler
authors.forename: Richard R
authors.initials: RR
authors.lastname: Schrock
mesh_terms: D000588:Amines / Q000737:chemistry*; D001665:Binding Sites; D002384:Catalysis; D015392:Chemistry, Inorganic / Q000379:methods*; D002712:Chlorides / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D009584:Nitrogen / Q000737:chemistry; D010420:Pentanes / Q000737:chemistry; D013696:Temperature; D014965:X-Rays
chemical_list: D000588:Amines; D002712:Chlorides; D008670:Metals; D010420:Pentanes; C033353:pentane; D006859:Hydrogen; D009584:Nitrogen