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The metalla-norbornadiene complex 1, extended by two phosphaalkyne units in the 1,4-position, is formed by an unprecedented pentamerization of the phosphaalkyne MesC identical withP (Mes=2,4,6-Me(3)C(6)H(2)) in the coordination sphere of the transition metal complex [W(CO)(5)(thf)].
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Kramkowski et al. (1999) studied this question.
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