| Abstract
| - The reaction of 1,8-bis(trimethylstannyl)naphthalene (1) and GaCl3 in toluene yields the cyclic tin−gallium bifunctional Lewis acid 2, which can be converted into the bis(pyridine) adduct 3.
- The reaction of equimolar quantities of 1,8-bistrimethylstannylnaphthalene (1) and GaCl3 in tolueneyields a stannagallacycle, namely, bis(μ-1,8-naphthalenediyl)(μ-chloride)methyltin(IV)chlorogallium(III) (2).Compound 2 is insoluble in solvents of low polarity andhas 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 achloride ligand bridging the two metals. When treatedwith pyridine, formation of a soluble bis(pyridine) adduct (3) occurs. Compound 3 has been characterized byEA and 1H, 13C, and 119Sn NMR spectroscopy. As shownby X-ray single-crystal analysis of 3, the central eight-membered dimetallacycle of the molecule has remainedintact on going from 2 to 3. Compound 3 does not featurea bridging chloride, and its structure is that of a Lewisacid−Lewis base adduct in which two independentpyridine molecules coordinate the metal centers.
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