Arsonochloroacetic acid (HOOC-CHCl-AsO3H2) has been synthesized by the
action of alkaline arsenite on dichloroacetic acid; chloromethylarson
ic acid (CI-CH2-AsO3H2) was obtained from it by decarboxylation. Bromi
nation of arsonoacetic acid yielded dibromomethylarsonic acid (Br2CH-A
sO3H2).