C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/662.1
C07C 21/04 (2006.01) C07C 17/25 (2006.01)
Patent
CA 1070333
ABSTRACT A process for the preparation of a 1,1-dihalo-1,3-diene of the general formula Image (I) in which Hal represents a chlorine, bromine or iodine atom, and R1, R2, R3 and R4 each represents a hydrogen atom or an alkyl group, which comprises reacting a tetrahaloalkane of the general formula: Image (II) with a tertiary amine at a temperature of at least 100°C. The process of the invention is useful in the preparation of intermediates in the production of pyrethrin-type insecticides.
251627
Na
Shell Canada Limited
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