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1789 evacuation, and thawing to a residual pressure of 10 -J Tort: the tube was filled with argon, sealed, and kept at 120 ~ for 6 h. The polymer that formed was precipitated with ethanol and dried to constant weight.The authors express their gratitude to V. P. Nefedov and T. A. Zyablikova for the investigations of the reaction mixture by GC and ~H NMR spectroscopy. Referencesl. V. V. Ershov, G. A. Nikiforov, and A. A. Voiod "kin, Khimiya prostranstvenno-zatrudnennykh fenolov [Chemistry of Steri-cally ttindered Phenols], Khimiya, Moscow, L972 (in Russian). 2. USSR Invention Certificate No. 819078, Byul. Izobret., A solution of metallic ytterbium in liquid ammonia reacts readily with various carbonyl complexes of metals to form the corresponding Ianthanide carbonylmetallates. The reaction of an excess of Yb in liquid NH 3 with [CpFe(CO)2]2 gave (THF)4Yb[Fe(CO)2CP] 2 in 42% yield. It was suggested that the resulting complex contains two equivalent Yb--Fe bonds.

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