Organic Phosphorus Compounds 94 ¹ Preparation, Physical and Biological Properties of Amino-Arylmethylphosphonic- And-Phosphonous Acids

The preparation, physical and spectroscopic properties of amino-arylmethylphosphonic- and -phosphonous acids, the phosphorus analogues of phenylglycine, are described. It is shown that several of the compounds prepared exhibit antifungal activity at 200 ppm. Thus 1e, 1f, 1g and 1h showed activity against Erysiphe (barley), 2a against Puccinia (wheat) and 6a against Botrytis (apple). Of particular interest is the high gameticidal activity of 3a in the greenhouse.