Abstract
AbstractReaction of Sr(2‐Me2N‐α‐Me3Si‐benzyl)2·(THF)2 with one equivalent of DIPP(H)N–BH–N(H)DIPP (NBN–H2, DIPP = 2,6‐iPr‐phenyl) gave the strontium bora‐amidinate complex Sr(NBN)·(THF)4. Traces of silicone grease, however, can change the course of the reaction completely and gave the product {Sr[(DIPP)NSiMe2O]·THF}4 (1) in a ca. 25 % yield. Complex 1 is a S4 symmetric cluster with a Sr4O4 core and four chelating amide side arms. From the mother liquor a second product could be isolated: the dimeric cluster [Sr(NBN‐SiMe2OSiMe2O)·THF]2 (2). Whereas the synthesis of complex 2 is not reproducible, complex 1 can be prepared by deliberate addition of silicone grease. Also, it was found that Sr[N(SiMe3)2]2, 2,6‐diisopropylphenyl and cyclic hexamethyltrisiloxane can be used as the reagents. For reactions with silicone grease, a mechanism, in which silicone precoordinates the central Sr atom followed by nucleophilic Si–O bond fission is proposed.
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