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
除虫菊酯酸是通过进行环加成反应,将共轭二烯和二卤代酮反应,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,然后用碱催化进行环收缩,形成所需的酸类产物。