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I am not able to identify the molecule C[Mg+]. I came across it a number of times in the USPTO-50k dataset, in reactions such as the one shown below:
CON(C)C(=O)c1cn(-c2ccc(Cl)cc2)c(-c2ccc(Cl)cc2Cl)n1.C[Mg+]>>CC(=O)c1cn(-c2ccc(Cl)cc2)c(-c2ccc(Cl)cc2Cl)n1
I searched in PubChem and MolView and cou...