'-ACYLOXY-CROTONIC ACID AMIDE-N-SULFOHALIDES, A PROCESS FOR THEIR PREPARATION AND THEIR TRANSFORMATION SWEETENERS

摘要

Compounds of the formula (III) in which R represents an alkyl radical having from 1 to 4 carbon atoms and Hal stands for fluorine or chlorine are prepared by reacting at a temperature of from -40 to +20.degree.C an i-propenyl-alkanoic acid ester of the formula (IV) with an isocyanete of the formula O-C-N-SO2Hal (V) in which R and Hal have the same meaning as above, and isolating the compound of formula III.