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Further Information

Related Reactions
Kumada Coupling
Nozaki-Hiyama Coupling
Reformatsky Reaction
Weinreb Ketone Synthesis

Grignard Reaction
Grignard Reagents

The Grignard Reaction is the addition of an organomagnesium halide (Grignard reagent) to a ketone or aldehyde, to form a tertiary or secondary alcohol, respectively. The reaction with formaldehyde leads to a primary alcohol.

Grignard Reagents are also used in the following important reactions: The addition of an excess of a Grignard reagent to an ester or lactone gives a tertiary alcohol in which two alkyl groups are the same, and the addition of a Grignard reagent to a nitrile produces an unsymmetrical ketone via a metalloimine intermediate. (Some more reactions are depicted below)

Mechanism of the Grignard Reaction

While the reaction is generally thought to proceed through a nucleophilic addition mechanism, sterically hindered substrates may react according to an SET (single electron transfer) mechanism:

With sterically hindered ketones the following side products are received:

The Grignard reagent can act as base, with deprotonation yielding an enolate intermediate. After work up, the starting ketone is recovered.

A reduction can also take place, in which a hydride is delivered from the β-carbon of the Grignard reagent to the carbonyl carbon via a cyclic six-membered transition state.

Additional reactions of Grignard Reagents:

With carboxylic acid chlorides:

Esters are less reactive than the intermediate ketones, therefore the reaction is only suitable for synthesis of tertiary alcohols using an excess of Grignard Reagent:

With nitriles:

With CO2 (by adding dry ice to the reaction mixture):

With oxiranes:

Recent Literature

Mechanochemical synthesis of magnesium-based carbon nucleophiles in air and their use in organic synthesis
R. Takahashi, A. Hu, P. Gao, Y. Gao, Y. Pang, T. Seo, J. Jiang, S. Maeda, H. Takaya, K. Kubota, H. Ito, Nat. Commun., 2021, 12, 6691-6701.

Added-Metal-Free Catalytic Nucleophilic Addition of Grignard Reagents to Ketones
H. Zong, H. Huang, J. Liu, G. Bian, L. Song, J. Org. Chem., 2012, 77, 4645-4652.

Zinc(II)-Catalyzed Addition of Grignard Reagents to Ketones
M. Hatano, O. Ito, S. Suzuki, K. Ishihara, J. Org. Chem., 2010, 75, 5008-5016.

Highly Enantioselective Desymmetrization of Anhydrides by Carbon Nucleophiles: Reaction of Grignard Reagents in the Presence of (-)-Sparteine
R. Shintani, G. C. Fu, Angew. Chem. Int. Ed., 2002, 41, 1057-1059.

Three-Component Coupling Reactions of Thioformamides with Organolithium and Grignard Reagents Leading to Formation of Tertiary Amines and a Thiolating Agent
M. Hatano, S. Suzuki, K. Ishihara, J. Am. Chem. Soc., 2006, 128, 9998-9999.

A highly efficient three-component coupling reaction between thioformamides and organolithium and Grignard reagents was developed. The generality of the process has been demonstrated by using various combinations of reactants and reagents.
T. Murai, F. Asai, J. Am. Chem. Soc., 2007, 129, 780-781.

Soluble Lanthanide Salts (LnCl3•2 LiCl) for the Improved Addition of Organomagnesium Reagents to Carbonyl Compounds
A. Krasovskiy, F. Kopp, P. Knochel, Angew. Chem. Int. Ed., 2006, 45, 497-500.

Highly Catalytic Asymmetric Addition of Deactivated Alkyl Grignard Reagents to Aldehydes
C.-S. Da, J.-R. Wang, X.-G. Yin, X.-Y. Fan, Y. Liu, S.-L. Yu, Org. Lett., 2009, 11, 5578-5581.

Low-Temperature Formation of Functionalized Grignard Reagents from Direct Oxidative Addition of Active Magnesium to Aryl Bromides
J.-s. Lee, R. Valerde-Ortiz, A. Guijarro, R. D. Rieke, J. Org. Chem., 2000, 65, 5428-5430.

i-Pr2NMgCl·LiCl Enables the Synthesis of Ketones by Direct Addition of Grignard Reagents to Carboxylate Anions
K. Colas, A. C. V. D. dos Santos, A. Mendoza, Org. Lett., 2019, 21, 7851-7856.

Chemoselective Synthesis of Aryl Ketones from Amides and Grignard Reagents via C(O)-N Bond Cleavage under Catalyst-Free Conditions
P. Sureshbabu, S. Azeez, N. Muniyappan, S. Sabiah, J. Kandasamy, J. Org. Chem., 2019, 84, 11823-11838.

Sodium Methyl Carbonate as an Effective C1 Synthon. Synthesis of Carboxylic Acids, Benzophenones, and Unsymmetrical Ketones
T. E. Hurst, J. A. Deichert, L. Kapeniak, R. Lee, J. Harris, P. G. Jessop, V. Snieckus, Org. Lett., 2019, 21, 3882-3885.

The reaction of Grignard reagents with O-alkyl S-pyridin-2-yl thiocarbonates provides esters via chelation-stabilized intermediates.
S. Usami, T. Suzuki, K. Mano, K. Tanaka III, Y. Hashimoto, N. Morita, O. Tamura, Synlett, 2019, 30, 1561-1564.

Regioselective Halogen-Metal Exchange Reaction of 3-Substituted 1,2-Dibromo Arenes: The Synthesis of 2-Substituted 5-Bromobenzoic Acids
K. Menzel, L. Dimichele, P. Mills, D. E. Frantz, T. D. Nelson, M. H. Kress, Synlett, 2006, 1948-1952.

A LiCl-Mediated Br/Mg Exchange Reaction for the Preparation of Functionalized Aryl- and Heteroarylmagnesium Compounds from Organic Bromides
A. Krasovski, P. Knochel, Angew. Chem. Int. Ed., 2004, 43, 3333-3336.

Grignard Reactions in Imidazolium Ionic Liquids
S. T. Handy, J. Org. Chem., 2006, 71, 4659-4662.

Addition of Grignard Reagents to Aryl Acid Chlorides: An Efficient Synthesis of Aryl Ketones
X.-J. Wang, L. Zhang, X. Sun, Y. Xu, D. Krishnamurthy, C. H. Senanayake, Org. Lett., 2005, 7, 5593-5595.

Selective Acylation of Aryl- and Heteroarylmagnesium Reagents with Esters in Continuous Flow
B. Heinz, D. Djukanovic, M. A. Ganiek, B. Martin, B. Schenkel, P. Knochel, Org. Lett., 2020, 22, 493-496.

Highly Alkyl-Selective Addition to Ketones with Magnesium Ate Complexes Derived from Grignard Reagents
M. Hatano, T. Matsumura, K. Ishihara, Org. Lett., 2005, 7, 573-576.

Synthesis of Arylglycines by Reaction of Diethyl N-Boc-iminomalonate with Organomagnesium Reagents
P. Cali, M. Begtrup, Synthesis, 2002, 63-64.

Conversion of Imines into C,N-Dimagnesiated Compounds and Trapping with Electrophiles. One-Pot Access to 1-Azaspirocyclic Framework
V. Gandon, P. Bertus, J. Szymoniak, Synthesis, 2002, 1115-1120.

Synthesis of 2-Substituted Pyridines via a Regiospecific Alkylation, Alkynylation, and Arylation of Pyridine N-Oxides
H. Andersson, F. Almqvist, R. Olsson, Org. Lett., 2007, 9, 1335-1337.