Differing reactivities of P≡CMe and P≡CBut towards a triphosphabenzene and a tetraphosphabarrelene: Synthesis of new phosphaalkyne pentamers (P5C5MenBut5−n, n = 0, 1 or 2)

Cameron Jones, Christian Schulten, Andreas Stasch

Research output: Contribution to journalArticleResearchpeer-review


The reaction of excess P≡CMe with the triphosphabenzene, 1,3,5-P3C3But3, yields a phosphaalkyne pentamer, P5C5Me2But3, which displays a pentaphosphaisolumibullvalene core structure. Its treatment with [W(CO)5(THF)] gives a complex of this cage, [(W(CO)5)2(µ-η11-P5C5Me2But3)], which has been structurally characterised. In contrast, the previously reported reaction of P≡CBut with 1,3,5-P3C3But3, affords, in addition to the known tetraphosphabarrelene, 1,3,5,7-P4C4But4, a new phosphaalkyne pentamer (P5C5But5), which has a partially unsaturated “open cage” core. Although P≡CBut does not react with 1,3,5,7-P4C4But4, the reaction of P≡CMe with the tetraphosphabarrelene is shown to give a mixture of products. Treatment of these with [W(CO)5(THF)] leads to the isolation of the tungsten carbonyl complex, [(W(CO)5)(W(CO)4)(µ-η14-P5C5MeBut4)], which has been structurally characterised. This study suggests that P≡CMe has a significantly greater reactivity towards cycloadditions than its bulkier counterpart, P≡CBut.

Original languageEnglish
Pages (from-to)1929-1933
Number of pages5
JournalDalton Transactions
Issue number19
Publication statusPublished - 26 Mar 2007

Cite this