ROOM-TEMPERATURE CYCLOPENTADIENE ELIMINATION-REACTION FOR THE SYNTHESIS OF DIETHYLGALLIUM-AMIDES, DIETHYLGALLIUM-PHOSPHIDES, AND DIETHYLGALLIUM-THIOLATES - CRYSTAL AND MOLECULAR-STRUCTURES OF [ET(2)GAP(T-BU)(2)](2) AND [ET(2)GAS(SIPH(3))](2)

The compounds [Et(2)GaNEt(2)](2), [Et(2)GaN(H)(Me)](2), [Et(2)GaN(H)(t -Bu)](2), [Et(2)GaP(i-Pr)(2)](2), [Et(2)GaP(t-Bu)(2)](2), and [Et(2)Ga S(SiPh(3))](2) have been prepared in high yields at room temperature b y the elimination of cyclopentadiene from Et(2)Ga(C5H5) and the corres ponding amine, phosphine, or thiol. The three diethylgallium amides an d [Et(2)GaP(i-Pr)(2)](2) are liquids, whereas the other phosphide and the thiolate are crystalline solids at room temperature, All compounds were fully characterized by elemental analyses, H-1 and P-31 NMR spec troscopy, and cryoscopic molecular weight studies in benzene, as appro priate, and are dimeric in solution. The crystalline compounds [Et(2)G aP(t-Bu)(2)](2), and [Et(2)GaS(SiPh(3))](2) were characterized by X-ra y structural studies. Even though [Et(2)GaN(H)(t-Bu)](2) and [Et(2)GaS (SiPh(3))](2) were prepared at room temperature and isolated in high y ield, H-1 NMR studies revealed that neither compound was formed. in hi gh yield in solution. Removal of the cyclopentadiene by either dimeriz ation or distillation and/or dimerization of the gallium product are n ecessary to prevent the back-reaction to re-form the reactants.