NEW MATERIAL: Compounds of formula I (R1 is 1-4C alkyl; X1 is 1-8 alkyl, 2-8C alkenyl, 2-8C alkynyl, aryl, aralkyl, Cl, Br), formula II (Y1 is Cl, Br; R2 is lower alkyl, phenyl; n is 0-2), formula III (X2 is 1-26C alkyl, 2-26 alkenyl, 2-26C alkynyl, aryl, aralkyl, formula IV, formula V, etc.; R3 is methyl, ethyl; Y2 is Cl, Br, I), formula VI, formula VII; formula VIII (R4, R5 are each lower alkyl, or a hydrocarbon chain forming a 5- or 6-membered ring by linking R4 and R5 together; R6 is phenyl, lower alkyl, etc.).
EXAMPLE: (Z)-4-Bromo-1-methoxy-1,1,2-trifluoro-2-butene.
USE: Intermediates in the synthesis of insecticides, fluorine-substituted drugs, etc.
PROCESS: A compound of formula IX is reacted with a chlorine-cation etc., generating reagent to obtain a compound of formula I in which X1 is Cl, Br.
MATSUO NORITADA
