Thermolysis of 2-(3-aryl-isoxazol-5-yl) benzoic halides from...

Details Thermolysis of 2-(3-aryl-isoxazol-5-yl) benzoic halides from... Thermolysis of 2-(3-aryl-isoxazol-5-yl) benzoic halides from...

C - Chemistry, Metallurgy

07

D

260/311.9

C07D 261/08 (2006.01)

Patent

CA 1137494

ABSTRACT OF THE DISCLOSURE This invention provides a process for preparing 2-(3-aryl-5-isoxazol)benzoyl halide having the formula Image wherein X and Y are independently selected from the group consisting of hydrogen, halogen, lower alkyl, lower alkoxy, halo-lower-alkyl, phenoxyphenyl and cyano and wherein X1 is a chloro, bromo, fluoro or iodo; which comprises treating 3'-(aryl)-spirocisobenzofuran-l(3H)5'(4'H)-isoxazol] 3-one having the formula Image wherein X and Y are as previously defined, with an acid halide and water. The compounds obtained are effective as plant growth regulants. The process overcomes the need to convert isoxazolin-5-yl benzoate with N-bromosuccinimide or dichlorodicyanobenzoquinone since isoxazolin-5-yl benzoates are prepared from vinyl benzoates which are difficult to prepare.

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