Reaction of M(C5Me5)2(OEt2), M = Eu or Yb, with phenylacetylene; formation of mixed-valence Yb3(C5Me5)4(µ-CCPh)4and Eu2(C5Me5)2(µ-CCPh)2(tetrahydrofuran)4

Abstract
Reaction of yb (C5Me5)2(OEt2) with PhCCH yields the mixed-valence complex Yb3(C5Me5)4(µ-CCPh)4 though Eu(C5Me5)2(OEt2) reacts with PhCCH to give the divalent complex Eu2(C5Me5)2(µ-CCPh)2(thf)4(thf = tetrahydrofuran)after crystallization from thf.

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