发明授权
US5294721A Process for the preparation of pyridinium intermediates 失效
制备吡啶鎓中间体的方法

Process for the preparation of pyridinium intermediates
摘要:
A process for the preparation of halobenzoic acids, comprising the step of reacting a halonitrobenzene with a pyridinium salt to form an intermediate of the formula ##STR1## wherein R is selected from the group consisting of hydrogen, alkyl, aryl, alkenyl, alkynyl, --CN, --COOR' and --COR' where R' is alkyl or aryl; X is chloro or fluoro; Y is hydrogen, chloro or fluoro; and Z is chloro, bromo or iodo.
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