Facile Reduction of Early Transition Metal Halides with Nonconventional, Mild Reductants. Part 5. Gallium and Gallium Dichloride, New Solid-State Reductants in Preparative Transition Metal Chemistry. New, Lower Temperature Syntheses and Convenient Isolation of Hexatantalum Tetradecachloride Octahydrate, Ta6(μ-Cl)12Cl2 (OH2)4×4H2O, and Synthesis and Solid-State Structure of a Tetraalkylammonium Derivative, [N(CH2Ph)Bu3]4 [Ta6(μ-Cl)12Cl6], of the Reduced [Ta6(μ-Cl)12]2+ Cluster Core.