(Tetramethylcyclobutadiene)cobalt Complexes − Syntheses of Tris(ligand) Derivatives and Structures of [(C4Me4)Co(CO)3]BF4 and [(C4Me4)Co(NCMe)3]PF6

(Tetramethylcyclobutadiene)cobalt complexes with monoanionic carborane ligands [9-L-7,8-C2B9H10]− (L = SMe2, NMe3 and py)

“…We prepared the first examples of such compounds, complexes 3a-3d, using reactions of anions 1a-1d with Cb*Co(CO) 2 I or [Cb*Co(MeCN) 3 ] + (Scheme 3) [11]. The reaction of sodium derivatives of anions 1a, 1c, 1d with the (carbonyl)iodide complex Cb*Co(CO) 2 [1,13]) readily proceeds at room temperature and gives 3a-3d in high yields.…”

Synthesis of cationic complexes [(C4Me4)CoL]+ (L is naphthalene, phenanthrene, and anthracene)

“…1- 6 We have recently de scribed the efficient methods for the syntheses of the co balt tetramethylcyclobutadiene complexes with five elec tron ligands of different types. [7][8][9][10][11][12][13] In this work, we syn thesized the [Cb*CoL] + complexes (Cb* = C 4 Me 4 , L is polyarene).…”

(Tetramethylcyclobutadiene)cobalt complexes 10. Synthesis of arene complexes [(C4Me4)Co(arene)]+ and mechanism of the arene exchange reaction

“…15 It turned out that reflux of compound 2a in nitromethane in the presence of mesitylene also leads to the arene exchange with the formation of complex 2e. However, the reaction rate in this case is considerably lower than under photo chemical conditions: within 5 h the conversion was only 20%.…”

“…We have shown that the benzene ligand in complex 2a can be replaced with acetonitrile upon irradi ation with visible light or reflux in acetonitrile. 15 Thus obtained tris(acetonitrile) complex [Cb*Co(MeCN) 3 ] + (3) was used for the synthesis of arene complexes with poly aromatic hydrocarbons, for example, biphenyl and naph thalene. 16,17 In the present work, we describe the arene exchange reactions (exchange of one arene ligand for another) in cation 2a, as well as other methods for the synthesis of arene complexes [Cb*Co(arene)] + .…”