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The reaction of GeCl2·dioxane with the sodium salts NaMCp(CO)3 (M = Cr, Mo, W) leads to new four‐membered ring compounds Ge4Cl4[MCp(CO)3]4, where the remaining chlorine atom cannot be substituted by another MCp(CO)3 substituent. A large excess of the sodium salts only leads to some minor side‐reactions. All Ge4‐compounds exhibit a non‐planar four‐membered Ge4 ring, which can be traced back to electrostatic...
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