Abstract
The electrochemical reduction of the tricarbonylchromium alkyl-tropylium tetrafluoroborates (TCC-R−C7H6+BF4−; R=Me, Et, Pri and But) and of the tricarbonylmolybdenum and tungsten tetrafluoroborates (TCM-C7H7+BF4−; M=metal) was investigated in MeCN andMeCN+MeCOOH 50:50 V:V. The voltammetric and coulometric results suggest that the process involves the reversible transfer of two electrons to form the complexed cycloheptatrienyl anion. In MeCN, this intermediate couples with the unreduced cation to produce the bis-complexed bitropyl and the rate of dimerization is strongly affected by the steric size of the alkyl group. On the other hand, in MeCN MeCOOH the TCM-cycloheptatrienyl anion undergoes a competitive attack from H+ and the starting cation toform TCM-cycloheptatriene and (TCM)2-bitropyl respectively. The ratio monomer: dimer depends upon both the alkyl group and the nature of the metal.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
