4-Chlorophenol → 1-Chloro-2-(2-chloroethoxy)benzene

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反応手順

A process for the preparation of 2-(2-chloroethoxy)-benzenesulfonamide of formula I ##STR15## which process comprises the etherification of 4-chlorophenol of formula II ##STR16## with ethylene carbonate at a temperature between +130° C. and +150° C. and chlorination of the resulting 2-(2-hydroxyethoxy)-chlorobenzene of formula III ##STR17## with phosgene at a temperature between +70° C. and +90° C. to give 2-(2-chloroethoxy)-chlorobenzene of formula IV ##STR18## which is converted with chlorosulfonic acid, at a temperature between +20° C. and +60° C. and subsequent neutralization with sodium hydroxide to the sulfonic acid sodium salt of formula V ##STR19## which is hydrogenated at a temperature between +20° C. and +70° C. to the compound formula VI ##STR20## which is subsequently reacted with phosgene at a temperature between +60° C. and +120° C. to the sulfonic acid chloride of formula VII ##STR21## which is reacted with ammonia at a temperature between 0° C. and +100° C. to the sulfonamide of formula I.

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