Y. Tamura, H. Shindo, J. Uenishi and H. Ishibashi
Introduction of α-(acyl) methylthiomethyl group into the aromatic ring by Friedel-Crafts reaction
Tetrahedron Letters
Volume 21, Issue 26, 1980, Pages 2547-2548
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http://dx.doi.org/10.1016/0040-4039(80)80124-9