The reactions of hydrogen bromide, ethanol, butylamine and methylamine with ethyl 4, 4, 5, 5, 6, 6, 6-heptafluoro-2-hexeno-ate gave ethyl 3-bromo-, 3-ethoxy, 3-butylamino-and 3- methylamino-4, 4,~, j, B, 6,~, 6-heptafluorol~ e~ anoates, respectively Additions of ethyl glycinate and ethyl mercaptoacetate to the same unsaturated ester gave diethyl 4- perfluoropropyl-3-azahexanedioate and diethyl 4-perfluoropropyl-3-thiahexanetiioate; the ...