A highly efficient and practical procedure to direct ortho-sulfonylation of azobenzenes' C–H bond with arylsulfonyl chlorides has been developed. The method was applicable to both electron-rich and electron-deficient substrates and delivered good yields for 21 examples. This reaction provides a convenient access to ortho-sulfonylated azobenzenes under mild conditions.
C. Xia, Z. Wei, C. Shen, J. Xu, Y. Yang, W. Su and P. Zhang, RSC Adv., 2015, 5, 52588 DOI: 10.1039/C5RA06474K
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