1. Phosphorus–heteroatom bond cleavage by ytterbium metal. Synthesis of mono(η5-tetramethylphospholyl)ytterbium(II) chloride and thiolate complexes and structural characterisation of [Yb(μ-Cl)(η5-C4Me4P)(thf)2]2 and [Yb(μ-SPh)(η5-C4Me4P)(thf)2]2 Fran?is Nief,Louis Ricard J. Chem. Soc. Chem. Commun. 1994 2723