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In search for a pentacoordinated monoorgano stannyl cation |
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| Authors: | Mikhail S Nechaev Oleg V Chernov Ivan A Portnyagin Victor N Khrustalev Valery V Lunin |
| Institution: | a Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow 119991, Russian Federation b A.V. Topchiev Institute of Petrochemical Synthesis, RAS, Leninsky Prosp., 29, Moscow 119991, Russian Federation c A.N. Nesmeyanov Institute of Organoelement Compounds, RAS, Vavilov Str., 28, Moscow 119991, Russian Federation |
| Abstract: | Alkylation of Sn(OCH2CH2NMe2)2 (1) by MeI or MeOTf leads to a mixture of quaternary ammonium salts by alkylation of the NMe2 moiety. Reaction of Sn(acac)2 (2) with MeOTf gives unexpected redistribution product Sn(acac)OTf (3), which is a rare example of mono acetylacetonato tin (II) derivatives. Pentacoordinated monoorgano stannyl cation  was generated by salt metathesis from PhSn(OCH2CH2NMe2)2Cl (5) and AgAl(OCH(CF3)2)4] or AgB(C6F5)4]. This cation was not isolated due to its strong electrophilic nature. It abstracts substituents from aluminate and borate weakly coordinating anions (WCAs) leading to redistribution products AlOCH(CF3)2]2OCH2CH2NMe2]2 (6) and Ph(C6F5)Sn(OCH2CH2NMe2)2]H2OB(C6F5)3] (9), respectively. Structures of 3 and 6 were established by single-crystal X-ray diffraction analysis. |
| Keywords: | Pentacoordinated monoorgano stannyl cation Stannylene Weakly coordinating anion |
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