Ylide–Metal Complexes. VII. The Preparation and Properties of IIA Group Metal(Be, Mg) and IIIA Group Metal(Al, Ga, In) Complexes of Alkylidenetriphenylphosphoranes

The reactions of (C6H5)3P=CH2 (L) with BeCl2 or MgCl2 in the mole ratio of 2 : 1 or 4 : 1 yield new dimeric compounds of di-μ-chloro-bis[(methylenetriphenylphosphorane)metal] dichloride, (Remark: Graphics omitted.) (M: Be and Mg). The configuration of these metals is trigonal. The reactions of L with AlCl3, GaCl3 or InCl3 in the mole ratio of 2 : 1 yield new compounds of di-μ-chloro-bis[bis(methylenetriphenylphosphorane)metal] tetrachloride, (Remark: Graphics omitted.) (M: Al, Ga, and In). The reactions of L with AlCl3 or GaCl3 in the mole ratio of 3 : 1 or 5 : 1 yield new compounds of μ-chloro-bis[tris(methylenetriphenylphosphorane)metal] pentachloride, [{(C6H5)3PCH2}3M–Cl–M{CH2P(C6H5)3}3]Cl5 (M: Al, Ga). These dimers, bridged by chloride anions, are thermally stable.