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Indium reacts with both Ph,S, and Ph,Se, in refluxing toluene to give the compounds In(EPh), (E = S or Se) in high yield. Under similar conditions tin gives Sn( EPh),. Thallium reacts with Ph,Se, t o form TI(SePh), but does not react with Ph, S, . Neither zinc nor gallium reacts with Ph,S, or Ph,Se,. With mixtures of Ph, E, and I , , indium yields the previously unreported In1 (EPh), compounds. The reactions of In(SePh), are those of a typical indium(iii) Lewis acid. Possible factors affecting the reactions of metals with Ph,S, or Ph,Se, are briefly discussed.

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Organoaluminum and -gallium thiolates are prepared in high yield by the reaction of triorganoaluminum and -gallium derivatives with thiols. In this way, [Mes2Al(M-SBz)]2 (Mes = 2,4,6-Me3C6H2 8), and {Me2Ga[w-S(2,6-Me2CeH3)]}4 (9) were prepared and crystallographically characterized. The dimethyl-and dimesitylaluminum thiolates 1-3 were determined to be dimeric with four-membered (A1S)2 rings. The structure of 1 was determined in space group P2i/n (No.