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A number of mixed hexa-alkyldigermanes have been prepared from germanium tetrachloride by using mixed organometallic reagents. The isomer ratios of several of these compounds have been determined by gas-liquid-chromatographic methods.TETRA-ALKYL and tetra-aryl derivatives of monogermane are most frequently prepared by the reaction of germanium tetrachloride with a Grignard reagent2 Rijkens and Glockling and Hooton4 have discussed how the normal course of this reaction can be affected by reductive coupling and by steric hindrance. Phenyl-,4 ~i n y l -, ~ and ethyl-magnesium bromide react with germanium tetrachloride to give, respectively, 69% (but only in the presence of an excess of magnesium), 25%, and 8% yields of the corresponding digermanes,

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