p-Toluenesulfonic acid → HCID 22004691, compound

Participants

Reaction Steps

396.7 g (1.5 mol) of 1-hydroxy-6-(2-methoxyphenyl)-3-oxocyclohexane-1-carboxylic acid were heated at reflux for two hours in 13.3 dm3 of toluene in the presence of 39.7 g of para-toluenesulphonic acid. The reaction mixture was subsequently concentrated under reduced pressure and the precipitate formed was filtered off, washed with isopropyl ether and then dried at 50° C. 288 g (78%) of (RS)-6-(2-methoxyphenyl)-3-oxocyclohexene-1-carboxylic acid were thus obtained in the form of a brown solid, the characteristics of which were as follows:

Provenance & Evidence