Ethylmagnesium bromide

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Ethylmagnesium bromide
Ethylmagnesiumbromide-Structural Formula V.svg
3D model (JSmol)
ECHA InfoCard 100.011.935
Molar mass 133.27 g·mol−1
Safety data sheet Oxford MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Ethylmagnesium bromide is a Grignard reagent with formula C2H5MgBr or C2H5Mg+·Br, namely a magnesium ion with a covalent bond to an ethyl group and an ionic bond to a bromine anion. It is widely used in the laboratory synthesis of organic compounds.


Apart from acting as the synthetic equivalent of an ethyl anion synthon for nucleophilic addition, ethylmagnesium bromide may be used as a strong base to deprotonate various substrates such as alkynes:[1][2][3]

RC≡CH + EtMgBr → RC≡CMgBr + EtH

In this application, ethylmagnesium bromide has been supplanted by the wide availability of organolithium reagents.


Ethylmagnesium bromide is commercially available, usually as a solution in diethyl ether or tetrahydrofuran. It may be prepared in the normal manner of Grignard reagents — by reacting bromoethane with magnesium in diethyl ether:[4]

EtBr + Mg → EtMgBr


  1. ^ Taniguchi, H.; Mathai, I. M.; Miller, S. I. (1970). "1-Phenyl-1,4-Pentadiyne and 1-Phenyl-1,3-Pentadiyne". Organic Syntheses. 50: 97.; Collective Volume, 6, p. 925
  2. ^ Quillinan, A. J.; Scheinmann, F. (1978). "3-Alkyl-1-alkynes Synthesis: 3-Ethyle-1-hexyne". Organic Syntheses. 58: 1.; Collective Volume, 6, p. 595
  3. ^ Newman, M. S.; Stalick, W. M. (1977). "1-Ethoxy-1-butyne". Organic Syntheses. 57: 65.; Collective Volume, 6, p. 564
  4. ^ Moyer, W. W.; Marvel, C. S. (1931). "Triethyl Carbinol". Organic Syntheses. 11: 98.; Collective Volume, 2, p. 602