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Synthesis and Solid State Structures of Sterically Crowded d0-Metallocenes of Magnesium, Calcium, Strontium, Barium, Samarium, and Ytterbium

Weber, Frank, Sitzmann, Helmut, Schultz, Madeleine, Sofield, Chadwick D., & Andersen, Richard A. (2002) Synthesis and Solid State Structures of Sterically Crowded d0-Metallocenes of Magnesium, Calcium, Strontium, Barium, Samarium, and Ytterbium. Organometallics, 21(15), pp. 3139-3146.

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Abstract

The base-free metallocenes [1,2,4-(Me3C)3C5H2]2Ca, [1,2,4-(Me3C)3C5H2]2Sr, and [1,2,4-(Me3C)3C5H2]2Ba have been prepared by reaction of MI2 and the sodium or potassium salt of the substituted cyclopentadiene anion in THF, while [1,2,4-(Me3C)3C5H2]2Mg was prepared from the cyclopentadiene, 1,2,4-(Me3C)3C5H3, and dibutylmagnesium. The structures of the magnesocene and calcocene as well as those of the previously prepared ytterbium and samarium analgoues have been determined by X-ray crystallography. The metallocenes are slightly bent in the solid state with centroid-metal-centroid angles ranging from 163 degrees to 173 degrees. Adducts of the strontocene and samarocene with THF and of the barocene, samarocene, and ytterbocene with 2,6-Me2C6H3NC have also been prepared and characterized. The massive bulk of the [1,2,4-(Me3C)3C5H2]- ligand leads to behavior quite different from that previously observed for base-free metallocenes of the alkaline earths and divalent lanthanides.

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ID Code: 9089
Item Type: Journal Article
Additional Information: This article is freely available from the American Chemical Society website 12 months after the publication date. See links to publisher website in this record.
DOI: 10.1021/om0108705
ISSN: 1520-6041
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > OTHER CHEMICAL SCIENCES (039900) > Organometallic Chemistry (039904)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2002 American Chemical Society
Deposited On: 20 Aug 2007
Last Modified: 09 Mar 2011 11:58

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