HERBICIDAL DERIVATIVES OF AMINOMETHYLENEBISPHOSPHONIC ACID .3. STRUCTURE-ACTIVITY RELATIONSHIP

Derivatives of aminomethylenebisphosphonic acids constitute a class of promising herbicides. More than 40 N-substituted aminomethylenephosph onic acids were synthesized and evaluated for their herbicidal activit y on common cress (Lepidium sativum L.) and cucumber (Cucumis sativus L.). Some of the tested compounds were found to exhibit strong herbici dal properties being equal in activity with the popular herbicide glyp hosate as well as parent N-pyridylaminomethylenephosphonic acids. N-Su bstituted iminodi(methylenephosphonic) acids, which may be considered as close analog of glyphosate, were inactive toward test plants.