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Supplementary Material Available: Listings of the complete crystallographic details, all positional and anisotropic thermal parameters, all bond lengths and angles, and observed and calculated structure factors for both structures (30 pages). Ordering information is given on any current masthead page.

Our initial observation that the vinyl group stabilized the electron-deficient bridged dimeric molecule Ga2(CH=CH2)6 lead us to postulate that the stabilization of this dimer resulted from metal-T-electron interactions.1 This stimulated our group, and others, to explore the structures of a variety of compounds including Al2[mirt,y-(/z-CH=CHC(CH3)3)]2(¡-Bu)4,2 Al2(c-Pr)6, Al2(M-C=CPh)2Ph4,4 Al2(,u-C= (1)

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