Process for preparing 1,1-dihalo-4-methyl-1,3-pentadienes

Details Process for preparing 1,1-dihalo-4-methyl-1,3-pentadienes Process for preparing 1,1-dihalo-4-methyl-1,3-pentadienes

1975-12-24

1978-03-28

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260633, 560124, C07C 1116

Patent

active

040814882

ABSTRACT:
1,1-Dihalo-4-methyl-1,3-pentadienes, key intermediates in the syntehsis of insecticidal dihalovinylcyclopropanecarboxylates, may be prepared in three steps beginning with the Friedel Crafts condensation of a vinylidene halide and an isobutyryl halide in the presence of a Lewis acid catalyst, followed by reduction of the 1,1-dihalo-4-methyl-1-penten-3-one produced thereby, and dehydration of the resulting 1,1-dihalo-3-hydroxy-4-methyl-1-pentene.

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