p-Toluenesulfonic acid → HCID 21162758, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 165 parts of ethyl N-phenylcarbamate and 10 grams of p-toluenesulfonic acid is heated, in a stirred autoclave, to 100° C. whilst stirring, and 112 parts of isobutene are pumped in over two hours. After completion of the addition of isobutene, the mixture is stirred for a further two hours at 100° C. It is then diluted with 100 parts of toluene and extracted with aqueous sodium carbonate solution, and the end product is distilled under reduced pressure. 169 parts (72% of theory, based on carbamic acid ester II) of ethyl N-(4-tert.-butylphenyl)-carbamate, of boiling point 125°-127° C./0.2 mbar, are obtained. The conversion is 76 percent.

Provenance & Evidence