Abstract
Limiting diffusion currents are estimated by an indirect method which consists in determining the chemical yield of substitution product in the electrosynthesis of a biaryl by an SRN type reaction. The limiting diffusion currents can then be deduced from the yields. Different industrial cathodic materials have been investigated both in liquid ammonia (−40° C) and dimethylformamide (20°C). The limiting diffusion currents are generally about 2.8 times larger in ammonia than in dimethyl-formamide.
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Abbreviations
- R :
-
yield in biaryl with respect to the reacted aromatic halide
- k d :
-
diffusion rate constant
- k 2 :
-
rate constant of the key-reaction between Ar• and Nu−
- A :
-
cathode area
- D :
-
diffusion coefficient of the mediator
- D 1 :
-
diffusion coefficient of mediator P 1
- D 2 :
-
diffusion coefficient of mediator P 2 (in the same medium as for D 1)
- D NH 3 :
-
diffusion coefficient of the mediator in NH3
- D DMF :
-
diffusion coefficient of the mediator in DMF
- D 2,NH 3 :
-
diffusion coefficient of mediator P1 in NH3
- D 2,NH 3 :
-
diffusion coefficient of mediator P2 in NH3
- D 2,DMF :
-
diffusion coefficient of mediator P2 in DMF
- δ:
-
diffusion layer thickness
- δNH 3 :
-
diffusion layer thickness in NH3
- δDMF :
-
diffusion layer thickness in DMF
- i lim :
-
limiting diffusion current of the mediator
- I lim :
-
limiting diffusion current of the mediator per unit of concentration of the mediator
- I lim :
-
limiting diffusion current of the mediator per unit of concentration of the mediator and per unit of cathode area
- I lim,NH 3 :
-
limiting diffusion current of the mediator in NH3 (normalized with respect to the cathode area and the concentration)
- I lim,DMF :
-
limiting diffusion current of the mediator in DMF (normalized with respect to the cathode area and the concentration)
- ip :
-
reduction peak current of the mediator
- ip NH 3 :
-
reduction peak current of the mediator in NH3 (measured by cyclic voltammetry)
- ip DMF :
-
reduction peak current of the mediator in DMF (measured by cyclic voltammetry in the same conditions of concentration, cathode and scan speed as in NH3)
- Ψ:
-
solvent association factor
- M s :
-
solvent molecular weight
- η:
-
solvent absolute viscosity
- V :
-
substrate molecular volume
- V 1 :
-
molecular volume of mediator P1
- V 2 :
-
molecular volume of mediator P2
- ω:
-
rotation speed of the electrode
- ν:
-
kinematic viscosity, ν = η/d
- d :
-
solvent density
- ArH :
-
amount of reduction product, mol
- ArNu :
-
amount of coupling product, mol
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Combellas, C., Lu, Y. & Thiebault, A. Electroinduced SRN 1 preparative reactions part 1: Estimation of the limiting diffusion currents on various cathodic materials in liquid ammonia and dimethylformamide. J Appl Electrochem 23, 841–847 (1993). https://doi.org/10.1007/BF00249958
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DOI: https://doi.org/10.1007/BF00249958