Reactivity of CpCo 16e half-sandwich complexes containing a chelating 1,2-dicarba-closo-dodecaborane-1,2-dichalcogenolate ligand toward phenylacetylene

Bao Hua Xu, De Hong Wu, Yi Zhi Li, Hong Yan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

The reaction of the 16e half-sandwich complex CpCo[S2C 2B10H10] (1S) with phenylacetylene at ambient temperature led to 2S, 3S, and 4S. In 3S the alkyne is twofold inserted into one of the Co-S bonds. In 4S B-substitution occurs at the ortho-carborane cage in the position B(3)/B(6) with the formation of a C-B bond. Upon heating, 3S catalyzed the cyclotrimerization of alkyne to give rise to 1,3,5- and 1,2,4-triphenylbenzenes. In comparison, CpCo[Se2C2B 10H10] (1Se) did not react with the alkyne at ambient temperature. However, if heated to 80°C, 2Se and 4Se (an analogue to 4S) were generated. Mechanistic implications on metal-induced B-H bond activation and catalytic cyclotrimerization of alkynes were elucidated. The solid-state structures of 2Se, 3S, and 4S have been determined by X-ray crystallography.

Original languageEnglish
Pages (from-to)4344-4349
Number of pages6
JournalOrganometallics
Volume26
Issue number17
DOIs
Publication statusPublished - 13 Aug 2007
Externally publishedYes

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