Bisphosphonic acid compound and herbicide consisting of it as active ingredient

Abstract

Abstract NEW MATERIAL:A bisphosphonic acid compound shown by the formula I (R 1 is H, alkyl, halogen; R 2 is H or alkyl; X is O or NH) and its salt. EXAMPLE: N-(5-isopropyl-3-isooxazolyl) aminomethylenediphosphonic acid. USE: A herbicide having improved weeding effect in the treatment after germination. A herbicide for treating stalks and leaves, e.g., a herbicide of weeds in the fruit garden, a herbicide for a ridge between rice fields. PROCESS: PCl 3 is reacted with H 3 PO 4 to give P 2 O 3 , which is reacted with a formylamino-pyrazole shown by the formula II, or formylamino-isooxazole at 30W70°C under heating to prepare a compound shown by the formula III. This compound is hydrolyzed to produce a compound shown by the formula I. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Fumio Suzuki
• 👤 Yoshihiro Fujikawa
• 👤 Yoshihiro Iwazawa
• 👤 Yuji Kawamura
• 👤 Takashi Igai
• 👤 Toshihiko Oguchi

Bibliographic Details