from the alkyl halide and Mg. The reductive transmetalation achieves:
:AdZnBr + Mg -> AdMgBr + Zn

Organomagnesium fluorides

Grignard reagents with chloride, bromide, and iodide are routine reagents. The corresponding fluorides RMgF were not synthesized until 1970. In 1920 Swarts reported the reduction of amyl fluoride to the corresponding hydrocarbon with activated magnesium, although no intermediates were identified. Alkylmagnesium fluorides were first prepared by Ashby and

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