Abstract
Abstract (1) has been isolated from the products of the room temperature reaction of Ph2GaCl with (Me3Si)3As (reactants mixed in both a 2:1 and a 3:1 mole ratio). A mixture of 1 and [Ph2GaAs (SiMe3)2]2 (2) was isolated after heating a 1:1 mole ratio combination of the same reactants. Reaction of pure 2 [prepared from Ph2GaCl and LiAs(SiMe3)2] with Ph2GaCl resulted in the formation of (1). Prolonged heating of 1 produced a mixture of 2, Me3SiCl and unidentified products. Compound 1 was structurally characterized by a single-crystal X-ray analysis and shown to be the first organogallium four-membered ring compound with both an arsenic and a halogen bridge. The ring of 1 is clearly non-planar as evidenced by the fact that the Cl atom is displaced from the Ga-As-Ga' plane to yield a dihedral angle of 8.8° between the Ga-As-Ga' and Ga-Cl-Ga' planes. Various other features of the structure of 1 are discussed.
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