Transmetalation as a route to a cyclic heteronuclear bifunctional Lewis acid containing tin and gallium
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abstract
The reaction of equimolar quantities of 1,8-bistrimethylstannylnaphthalene (1) and GaCl3 in toluene yields a stannagallacycle, namely, bis(-1,8-naphthalenediyl)(-chloride)methyltin(IV)chlorogallium(III)(2). Compound 2 is insoluble in solvents of low polarity and has been characterized by EA, MSCI, and X-ray analysis. The latter revealed the existence of a folded eight-membered dimetallacycle as well as the presence of a chloride ligand bridging the two metals. When treated with pyridine, formation of a soluble bis(pyridine) adduct (3) occurs. Compound 3 has been characterized by EA and 1H, 13C, and 119Sn NMR spectroscopy. As shown by X-ray single-crystal analysis of 3, the central eight-membered dimetallacycle of the molecule has remained intact on going from 2 to 3. Compound 3 does not feature a bridging chloride, and its structure is that of a Lewis acid-Lewis base adduct in which two independent pyridine molecules coordinate the metal centers.