ChemInform Abstract The Li compound (I) reacts with (II) to give the magnesate (IV) (no yield given) which is the first one of this type to be characterized by a crystal structure determination ( P21/n, Z=4). The reaction with CdBr2 (V) gives a compound (VI) with a cage anion crystallizing in P3 with Z=2. In the presence of traces of moisture, the neutral compound (VII) (Pnam, Z=4) is isolated. (VI) and (VII) can be converted into (VIII) on heating. The chloride compound (XII), obtained on heating from (XI), is dimeric in the gas phase. The cadmate (XIV) can be converted into (XV) and (XVII) ((XVIIa) obtained at reflux temp., (XVIIb) at 20 rc C). The trimanganate (XVIII), described previously, is characterized by an X-ray diffraction study (P21/m, Z=2). The different types of structure are discussed. In each C(SiMe3)3 group the three silyl fragments are twisted from fully staggered positions so the group as a whole is chiral.

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Molecules of the compound [(thf)3Li(p-H)3BC(SiMe2Ph)3], (thf = tetrahydrofuran) made by reduction of difluoro-{tris(dimethylphenylsilyl)methyl} boron with LiAIH4, have been shown by X-ray crystallography to have almost C3 symmetry, with tridentate bridges between alkyltrihydroborate and lithium.

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