Abstract
AbstractThe reaction of K{CH(PPh2NSiMe3)2} with samarium diiodide in a 1:1 molar ratio in thf affords the corresponding divalent samarium complex [{(Me3SiNPPh2)2CH}Sm(μ‐I)(thf)]2 (1), whereas treatment of K{CH(PPh2NSiMe3)2} with samarium diiodide in a 2:1 molar ratio in thf gives the homoleptic complex [{(Me3SiNPPh2)2CH}2Sm] (2). When 1 is treated with KNPh2 in toluene in a 2:1 molar ratio the mixed dimeric compound [({(Me3SiNPPh2)CH}2Sm)2(μ‐I)(μ‐NPh2)] (3) is obtained. The single‐crystal X‐ray structures of all these complexes have been determined. [{(Me3SiNPPh2)2CH}Sm(μ‐I)(thf)]2 has also been successfully used as a catalyst for the polymerization of ϵ‐caprolactone. Good activities and molecular masses are observed with this catalyst.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
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