Facile Carbon−Carbon Bond Cleavage in an (η<sup>3</sup>-Cyclooctenyl)cobalt Complex Exhibiting Agostic C···H···Co Bonding
作者:Robert B. Cracknell、Julian C. Nicholls、John L. Spencer
DOI:10.1021/om950727+
日期:1996.1.9
The reaction of [(η5-C5Me5)Co(η4-1,5-cyclooctadiene)] with HBF4·Me2O affords, at room temperature, an agostic η3-cyclooctenyl complex which undergoes a facile ring opening to afford anti-[(η5-C5Me5)Co(η5-1-propylpentadienyl)]BF4.
Transannular Interactions in Mixed Superphanes with One Thiophene and One CpCo-Stabilized Cyclobutadiene Ring: Syntheses, Structures, and Electrochemistry
Superphanes consisting of one thiophene ring and various substituted RCo-stabilized cyclobutadiene (CBD) rings (R = Cp, C5H4(CH3), C-5(CH3)(5), C5H4(Si(CH3)(3)), C5H4(COCH3), 8-12) and one superphane with one thiophene ring and one CpCo-stabilized cyclopentadienone ring (13) were synthesized. The starting point was a tricyclic diyne with a central thiophene ring and two condensed 4-cyclodecynes, 19. Heating of 19 with RCo(COD) yielded 8-12, whereas the heating of 19 with CpCo(CO)(2) gave 13. X-ray structural investigation of 8-13 afforded the geometrical parameters in the solid state. Cyclic voltammetry showed a strong interaction between the thiophene ring and the CpCo-stabilized cyclobutadiene part. This interaction was substantiated by comparison between the CV data of 8-12 and model systems containing only the CpCo(CBD) part.
Schneider, Joerg J., Zeitschrift fur Naturforschung, B: Chemical Sciences, 1995, vol. 50, # 7, p. 1055 - 1060