title: Reactivity of the 16e Cp*Co half-sandwich complex containing a chelating 1,2-dicarba-closo-dodecaborane-1,2-dithiolate ligand towards alkynes.
abstract: The 16e half-sandwich complex Cp*Co(S(2)C(2)B(10)H(10))(1, Cp* = pentamethylcyclopentadienyl) reacts with N-1-naphthylpropargylamide to afford two 18e complexes (2) and (3). 2 is a 1 : 1 adduct containing a four-membered metallacycle. In 3 the alkyne is twofold inserted into one Co-S bond in a head-head mode. Reactions of 1 with 1-(2-furyl)-2-propyn-1-one and 1-ferrocenyl-2-propyn-1-one lead to two types of alkyne twofold inserted products (4)/(5) and (6)/(7), respectively. The reaction of 1 with phenylacetylene gives rise to the sole complex (8) of the same structural type as 3, 4 and 6, whereas the reaction of 1 with dimethyl acetylene dicarboxylate affords the sole 1 : 1 adduct (9). Complexes 2-9 have been characterized by IR, NMR, elemental analysis and mass spectrometry, and 3-9 have also been determined by single-crystal X-ray diffraction analysis.
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Jiangsu, China.
authors.forename: Hong-De
authors.initials: HD
authors.lastname: Ye
authors.forename: Guan-Yu
authors.initials: GY
authors.lastname: Ding
authors.forename: Ming-Shi
authors.initials: MS
authors.lastname: Xie
authors.forename: Yi-Zhi
authors.initials: YZ
authors.lastname: Li
authors.forename: Hong
authors.initials: H
authors.lastname: Yan