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Pinacol Coupling Reaction

Lianyungang Klinechem Co.,Ltd | Updated: Dec 17, 2018

Pinacol Coupling Reaction

This reaction involves the reductive homo-coupling of a carbonyl compound to produce a symmetrically substituted 1,2-diol. The first step is single electron transfer of the carbonyl bond, which generates radical ion intermediates that couple via carbon-carbon bond formation to give a 1,2-diol. The example depicted above shows the preparation of pinacol itself.

Pinacol and other highly substituted 1,2-diols tend to undergo dehydration with rearrangement under acid-catalysis (see Pinacol Rearrangement).

Recent Literature


Catalytic, Highly Enantio- and Diastereoselective Pinacol Coupling Reaction with a New Tethered Bis(8-quinolinolato) Ligand
N. Takenaka, G. Xia, H. Yamamoto, J. Am. Chem. Soc.2004126, 13198-13199.


A highly enantioselective catalytic protocol for the intramolecular reductive coupling of ketones and hydrazones furnishes cyclic syn 1,2-amino alcohol derivatives with excellent levels of diastereo- and enantioselectivity. The reaction proceeds through neutral ketyl radical intermediates generated via a concerted proton-coupled electron transfer event jointly mediated by a chiral phosphoric acid catalyst and a photoredox catalyst.
L. J. Rono, H. G. Yayla, D. Y. Wang, M. F. Armstrong, R. R. Knowles, J. Am. Chem. Soc.2013135, 17735-17738.


A Convenient Synthesis of Unsymmetrical Pinacols by Coupling of Structurally Similar Aromatic Aldehydes Mediated by Low-Valent Titanium
X.-F. Duan, J.-X. Feng, G.-F. Zi, Z.-B. Zhang, Synthesis2009, 277-282.


Zn/InCl3-Mediated Pinacol Cross-Coupling Reactions of Aldehydes with α,β-Unsaturated Ketones in Aqueous Media
Y.-S. Yang, Z.-L. Shen, T.-P. Loh, Org. Lett.200911, 2213-2215.


Samarium Diiodide-Catalyzed Diastereoselective Pinacol Couplings
H. C. Aspinall, N. Greeves, C. Valla, Org. Lett.20057, 1919-1922.


Samarium(II)-Mediated Pinacol Coupling in Water: Occurrence of Unexpected Disproportionation and Action of Low-Valent Samarium as an Active Species
S. Matsukawa, Y. Hinakubo, Org. Lett.20035, 1221-1223.


Novel and efficient Ni-mediated pinacol coupling of carbonyl compounds
L. Shi, C.-A. Fan, Y.-Q. Tu, M. Wang, F.-M. Zhang, Tetrahedron, 200460, 2851-2855.


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