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The reactions of organic magnesium compounds are of two kinds - reactions of substitution and reactions of addition.
Organic compounds exist in which a hydrogen atom, joined to the carbon, acquires acid properties as a result of the proximity of certain functional groupings.
Whereas, generally speaking, zinc reacts suitably only with the first members of the alkyl iodides, with magnesium it is possible to use bromides, iodides, and in many cases, chlorides.
There are, in fact, very few organic zinc compounds; only the first members of the series, which correspond to the simplest organic radicals, can be prepared without too much difficulty, but they have the disadvantage of being spontaneously inflammable in air and are consequently very dangerous to handle.
On the terrace of the Pepiniere, the 150 pupils of the Institut Chemique talk chemistry as they leave the auditoria and the laboratory. The echoes of the magnificent public garden of the city of Nancy make the words reverberate; coupling, condensation, grignardization. Moreover, their clothes stay impregnated with strong and characteristic odours; we follow the initiates of Hermes by their scent. In such an environment, how is it possible not to be productive?