ethyl 3-oxo-8-hydroxy-9-chloro-6-undecynoate 、 喹啉 在
钯盐酸 、 水 作用下,
以
乙酸乙酯 为溶剂,
以to obtain 4.6 g of ethyl 3-oxo-8-hydroxy-9-chloro-cis-6-undecenoate with a refractive index of nD20 = 1.4800的产率得到Ethyl-3-oxo-8-hydroxy-9-chlor-6-cis-undecenoat
Novel tetrahydrofuran derivatives of the formula ##EQU1## wherein R is a branched or linear alkyl of 1 to 10 carbon atoms and R.sub.1 is alkyl of 1 to 5 carbon atoms and X is selected from the group consisting of chlorine, bromine, --OH and alkylcarbonyloxy of 2 to 5 carbon atoms useful as insecticides and their preparation.