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2-Chloro-3,6-difluoro-4-hydroxybenzenecarboxylic acid synthesis

4synthesis methods
-

Yield:749230-42-0 65%

Reaction Conditions:

Stage #1: [4-chloro-3,6-difluoro-2-(methoxymethoxy)phenyl]trimethylsilanewith 2,2,6,6-tetramethyl-piperidine;n-butyllithium in tetrahydrofuran;hexane at -75; for 2 h;
Stage #2: carbon dioxide in tetrahydrofuran;hexane;
Stage #3: with hydrogenchloride pH=1;

References:

Marzi, Elena;Gorecka, Joanna;Schlosser, Manfred [Synthesis,2004,# 10,p. 1609 - 1618]