1,4-Benzoquinone, BQ
1,4-Benzoquinone is a dehydrogenation reagent. The derivative 2,3-dichloro-5,6-dicyanobenzoquinone is a stronger oxidant.
Recent Literature

A Pd(PPh3)4-catalyzed reaction between α-diazocarbonyl
compounds and arylboronic acids leads to cross-coupled products in good yields.
C. Peng, Y. Wang, J. Wang, J. Am. Chem. Soc., 2008,
130, 1566-1567.

1,4-Benzoquinones have been found to prevent olefin isomerization of a number
of allylic ethers and long-chain aliphatic alkenes during ruthenium-catalyzed
olefin metathesis reactions. This mild, inexpensive, and effective method
increases the overall product yield and purity.
S. H. Hong, D. P. Sander, C. W. Lee, R. H. Grubbs, J. Am. Chem. Soc.,
2005,
127, 17160-17161.
