Efficient sulfonation of 1-phenylsulfonyl-1H-pyrroles and 1-phenylsulfonyl-1H-indoles using chlorosulfonic acid in acetonitrile
Tomasz Janosik, Tetrahedron
Volume 62, Issue 8, 20 February 2006, Pages 1699-1707
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dx.doi.org/10.1016/j.tet.2005.11.062