Bulky group 2 octaphenylmetallocenes and direct access to calcium and ytterbium pseudo-Grignard complexes

Deacon, Glen B., Jaroschik, Florian, Junk, Peter C., and Kelly, Rory P. (2015) Bulky group 2 octaphenylmetallocenes and direct access to calcium and ytterbium pseudo-Grignard complexes. Organometallics, 34 (11). pp. 2369-2377.

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View at Publisher Website: http://dx.doi.org/10.1021/om501150b
 
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Abstract

The reaction between Mg(nBu)2 and C5Ph4H2 in toluene at 100–110 °C yielded octaphenylmagnesocene, [Mg(C5Ph4H)2], which has two parallel Cp rings despite the steric bulk of the ligands. The redox-transmetalation/protolysis (RTP) reaction between calcium metal, HgPh2, and C5Ph4H2 in thf afforded the bent calcium sandwich complex [Ca(C5Ph4H)2(thf)]. Two rare calcium and ytterbium pseudo-Grignard complexes, [M(C5Ph4H)(µ-Br)(thf)2]2, were prepared from RTP reactions of the corresponding metal, PhHgBr, and C5Ph4H2 in thf. Reduction of the calcium bromide complex by KC8 in the presence of 18-crown-6 afforded the charge-separated potassium compound [K(18-crown-6)(thf)2][C5Ph4H], but no CaI species were detected.

Item ID: 41129
Item Type: Article (Refereed Research - C1)
ISSN: 1520-6041
Date Deposited: 29 Oct 2015 03:28
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030202 f-Block Chemistry @ 50%
03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030204 Main Group Metal Chemistry @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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