4,4'-Dichloro- and 4-chloro-4'-hydroxy-2,2'-bis(trifluoromethyl)diphenyl sulphoxides and sulphones
4,4'-Dichloro-2,2'-bis(trifluoromethyl)diphenyl sulphoxide can be prepared from 2-bromo-4-chlorobenzotrifluoride and converted to the 2,2'-bis(trifluoromethyl)diphenyl sulphone, although the oxidation is remarkably difficult owing to the steric protection
Clark, James H.,Denness, James E.,Wynd, Andrew J.
p. 249 - 252
(2007/10/02)
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