Pyrethroid acids are prepared by conducting a cycloaddition reaction of a conjugated diene and a dihaloketene to form a dihalo-vinylcyclobutanone product; reducing the dihalo-vinylcyclobutanone product to a monohalo-vinylcyclobutanone product and then conducting a ring contraction with a base to form the desired acid product.
拟
除虫菊酯酸的制备方法是通过将共轭二烯和二卤代酮进行环加成反应,形成二卤代
乙烯基环丁酮产物;将二卤代
乙烯基环丁酮还原为单卤代
乙烯基环丁酮产物,然后用碱进行环收缩,形成所需的酸产物。