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Cationic Brønsted Acids for the Preparation of SnIV Salts: Synthesis and Characterisation of [Ph3Sn(OEt2)][H2N{B(C6F5)3}2],[Sn(NMe2)3(HNMe2)2][B(C6F5)4] and [Me3Sn(HNMe2)2][B(C6F5)4]

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Abstract

Ph3SnN(SiMe3)2 ( 1 ) was prepared in good yields by reaction of [{NaN(SiMe3)2}2 · THF] ( 2 ) with Ph3SnF. Treatment of 1 with [H(OEt2)2][H2N{B(C6F5)3}2] ( 4 ) in dichloromethane afforded the stannylium cation [Ph3Sn(OEt2)][H2N{B(C6F5)3}2] ( 5 ), which was characterised by 1H, 13C{1H}, 11B, 19F and 119Sn NMR spectroscopy. The reaction of Sn(NMe2)4 with [Ph2MeNH][B(C6F5)4] ( 3 ) gave the amidotin(IV) compound [Sn(NMe2)3(HNMe2)2][B(C6F5)4] ( 6 ) which proved very stable towards ligand substitution and resisted treatment with Et2O, THF, TMEDA and pyrazine. Two new Brønsted acid salts [H(NMe2H)2][B(C6F5)4] ( 7 ) and [(C4H4N2)H · OEt2][H2N{B(C6F5)3}2] ( 8 ) were synthesised. The reaction of 7 with Sn(NMe2)4 in Et2O allowed the preparation of 6 in a much improved yield (83?%). The treatment of 7 with Me3SnN(SiMe3)2 in Et2O yielded [Me3Sn(HNMe2)2][B(C6F5)4] ( 9 ) nearly quantitatively. Compounds 1 , 2 , 6 , 8 and 9 were characterised by single-crystal X-ray diffraction analyses; 6 is the first example of a structurally characterised amidotin(IV)cation.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

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