[CKabes]

Suppose I take an acid chloride and add magnesium in the same way I would prepare a Grignard reagent from an alkyl chloride. Does the magnesium add into the C-X bond? Is this reagent nucleophilic? I can't find any discussion about this elsewhere.

[rolnor]

It does not work to make Grignard this way but you can make 1,2-diketones by reacting an acid chloride with pyrophoric lead. If you use umpolung-chemistry you can have a masked nucleophilic carbonylgroup;

https://en.m.wikipedia.org/wiki/Umpolung#Carbonyl_umpolung