Lithium hydroxide, monohydrate → HCID 53929988, compound

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Reaction Steps

A mixture of methyl 4-chloro-2-methoxy-3-(methylsulphenyl)benzoate (85% pure, 16.9 g) and lithium hydroxide monohydrate (3.85 g) in aqueous methanol was stirred at room temperature overnight. The mixture was evaporated then treated with water and acidified to pH1. It was extracted with ethyl acetate, dried (MgSO4) and filtered. The filtrate was evaporated to dryness to give 4-chloro-2-methoxy-3-(methylsulphenyl)benzoic acid (14.7 g) as a white solid m.p. 121.3°-122.7° C. NMR (CDCl3) 2.45(s,3H), 4.05(s,3H), 7.3(d.1H), 7.95(d,1H) containing only a trace of 4-chloro-3-(choromethylsulphenyl)-2-methoxybenzoic acid (determined by NMR).

Provenance & Evidence