Dictionary  Grignard' rea"gentChem. any of the group of reagents produced by the interaction of magnesium and an organic halide, usually in the presence of an ether, and having the general formula RMgX, where R is an organic group and X is a halogen: used in the Grignard reaction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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