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2005
Pyrazole derivatives
R 0180
Unexpected Behavior of 5-Phenoxypyrazole Derivatives. — Pyrazole oximes (I)
produce chlorophenyl ethers (IV) when they react with alkyl halides (II)
37- 117 preferentially
under basic conditions. This rather unexpected result is explained that the p-chlorophenoxy group serves as a good leaving group toward nucleophilic substitution. It is
interesting to note that the p-nitrophenoxy group proves to be a still more suitable substrate for nucleophilic aromatic substitution. — (PARK, H.-J.; LEE, J.-C.; KIM, Y.-J.;
LEE*, K.-I.; Bull. Korean Chem. Soc. 26 (2005) 4, 668-670; Bio-Org. Sci. Div.,
Korea Res. Inst. Chem. Technol., Taejon 305-600, S. Korea; Eng.) — A. Forchert
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