Which reagent is used in reformatsky reactions

The Reformatsky Reaction, Rathke, M. Shriner, R. Synthesis , The reaction occurs with all reasonably electron rich alkenes there is a small preference for electron rich alkenes , but works especially well for allylic alcohols and ethers, where chelation of Zn to the oxygen apparently plays an important role in both increasing the rate and controlling the stereochemistry.

Synlett , Bis iodozincio methane - Preparation, Structure, and Reaction. Matsubara, S. In the example below, neither the lithium nor the magnesium reagent does an intramolecular addition to the alkene, but the zinc reagent adds smoothly.

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