Directed ortho Lithiation in the Reactions of 3,5-Dimethyl- and 5-Trifluoromethyl-1-phenylpyrazoles with Butyllithium
Lithiation of 3,5-dimethyl- and 5-trifluoromethyl-1-phenylpyrazoles with butyllithium is found to be directed to an ortho position.The ortho direction is ascribed to coordination of lithium with pyrazole 2-nitrogen or 5-trifluoromethyl group, respectively.
Iwata, Satoru,Qian, Cheng-Ping,Tanaka, Kiyoshi
p. 357 - 360
(2007/10/02)
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