Phosphonic acid bis(o-haloarylesters) as well as the corresponding phosphoric acid derivatives are reacted with sodium giving bis(o-hydroxyary1)phosphinoxides and phosphonic acid esters or amides, resp. The primary metallation products undergo rapid 1.3-carbanionic rearrangements. Magnesium may also be used as metallating agent if activated by means of anthracen in THF.
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