Grignard reagents sacrificial anodes

TABLE 10. Organoelemental compounds produced by electro-oxidation of Grignard reagents 5 on sacrificial anodes... 

Moreover, in the divided cell the exo.endo ratio of bromosilanes was 91 9 in the anode compartment bnt only 52 48 in the cathode compartment. Thus, the nature of the ultrasonic effect was explained assuming that beside the electrochemical silylation at the cathode, a parallel silylation process occurs at a magnesium anode, namely the silylation by 70 of an intermediate Grignard reagent produced from dibromide 69. It appears as a rare example of the anodic reduction However, the increase in the current density dnring electrolysis cansed a decrease in the apparent current efficiency. This observation indicates a chemical natnre of the anodic process. Of course, the ultrasonic irradiation facihtates the formation of the organomagnesium intermediate at the sacrificial anode and the anthors reported a similar ultrasonic effect for the nonelectrochemical but purely sonochemical... 

Metal alkyls can be generated by anodic oxidation of a grignard reagent at a sacrificial metal anode. Tetraethyl lead is generated in this manner [16] ... 

Electroformylation of organic halides in DMF solvent provides an efficient electrosynthesis of aldehydes 14, which avoids the use of preformed Grignard or organolithium reagents (equations 13 and 14). A sacrificial magnesium or zinc electrode as the anode and stainless steel or nickel as the cathode gave optimal yields (30-85%). 

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