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Phénylhalogénohydrodigermanes

1972; Wiley; Volume: 55; Issue: 4 Linguagem: Inglês

10.1002/hlca.19720550412

1522-2675

P. Rivière, J. SATGÉ,

Structural Analysis of Composite Materials

Abstract The symmetric and unsymmetric phenylchlorohydrodigermanes can be isolated or characterized via partial halogenation of the GeH bonds of the symmetrical phenylhydrodigermanes Ph 2 (H)GeGe(H) 2 Ph, Ph(H) 2 GeGe(H) 2 Ph by chloromethyl methyl ether and carbontetrachloride. Some of these phenylchlorohydrodigermanes are formed by insertion of phenylchlorogermylene (PhGeCl) on the GeH or GeCl bonds of the phenylchlorohydrogermanes. The hydrolysis of the monochloro phenylhydrodigermanes Ph 2 (Cl)GeGe(H) 2 and Ph(Cl)(H)GeGe(H) 2 Ph leads to the phenyl phenylhydrogermyl digermoxanes [Ph 2 (H)GeGePh 2 ] 2 O and [Ph(H) 2 GeGe(H)Ph] 2 O. Treatment of these oxides with the concentrated aqueous solutions of hydracides leads to the monofluorinated, brominated and iodinated phenylhydrodigermanes Ph 2 (H)GeGe(X)Ph 2 and Ph(H) 2 GeGe(H)(X)Ph (X) = F, Br, I). Phenylchlorohydrodigermanes decompose thermally by α‐elimination on one germanium atom with formation of germylene and phenylchlorohydrogermane. The physico‐chemical IR. and NMR. study of these phenylhalogenohydrodigermanes indicates that, if the vGeH frequency variations are mostly linked to the inductive effects of the substituents on the same germanium, the variations of the chemical shifts of the GeH protons seem to be due to many factors and especially to the inductive effect of the substituents on the germanium and the magnetic anisotropy of the GeX bonds.