Benzyl groups are often used to protect alcohols in multi-step synthetic reactions. To deprotect, the benzyl ether first undergoes oxidative addition to the Pd(0) catalyst, forming a Pd(II) complex. Hydrogen coordination and transfer then facilitates the release of the alcohol. Reductive elimination expels toluene and regenerates the palladium catalyst.
- Reagents: Pd/C, H2, Solvent (EtOH, MeOH, THF, Toluene etc.)
- Reactant: Benzyl protected alcohol
- Product: Alcohol, Toluene
- Type of Reaction: Hydrogenolysis
Lab Tips
- Various other protocols have been developed, including using 1,4-cyclohexadiene as a hydrogen transfer source, [1] deprotection under mild, oxidative conditions, [2] or removal with chlorosulfonyl isocyanate-sodium hydroxide. [3][3][3][3]
1. Quinn et al. 1,4-Cyclohexadiene with Pd/C as a rapid, safe transfer hydrogenation system with microwave heating. Tetrahedron Lett. 2008, 49(42), 6137-6140.
2. Weinreb et al. Efficacious cleavage of the benzyl ether protecting group by electrochemical oxidation. J. Org. Chem. 1975, 40(9) 1356-1358.
Mechanism
Top Citations
- Debenzylation of N-Benzylamino Derivatives by Catalytic Transfer Hydrtyation With Ammonium Formate. Synthetic Communications 1987, 17 (4), 415–418.
- Influence of Catalyst Type, Solvent, Acid and Base on the Selectivity and Rate in the of 4-Chloro-N,N-Dibenzyl Aniline with PdC and H2. Journal of Molecular Catalysis A: Chemical 1996, 112 (3), 437–445.
Related Reactions
- N-Boc Protection and Deprotection
- Benzyl Protection of Alcohols
- Methyl-Ester Protection and Deprotection
Related Products
- TMS-Cl (CAS 75-77-4)
- DCM (CAS 75-09-2)
- Benzel Compound
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