ChemInform Abstract: Routes to Bis(amino)tin Dichlorides: Exchange Reactions Between Tin(IV) Chloride and Tin(II) and Tin(IV) Amides, and the Synthesis of a Cyclic Bis(amino)tin Dichloride from Tin(IV) Chloride and N,N′-Di-tert- butyl-1,3-diaminopropane via HCl Elimination.
Abstract
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ChemInform Abstract
While the bis(amino)stannylenes (I) and (III) react with SnCl4 to give the corresponding bis(amino)tin dichlorides in quantitative yield, the exchange reaction between (V) and SnCl4 is more complex. By monitoring the proceeding using 119Sn NMR two binuclear intermediates are observed. The equilibrated reaction mixture finally contains (VI), which decomposes during attempts of isolation. In general Sn(IV) halides do not react with sec. amines to afford aminotin derivatives. The reaction of (VII) with SnCl4 in the presence of two equiv. NEt3 does not give the desired product but (VIII), avoiding metalation and a multi-step synthesis. Therefore it is expected that (VIII) becomes a useful starting material in the chemistry of bis(amino)tin chlorides.
