| abstract |
NEW MATERIAL:A phosphorus-containing compound of formula I: (R is H or methyl group) or its salt. n EXAMPLE: N-(2-Amino-4-methylphosphinobutyryl)-alanine. n USE: Harbicides effective for annual weeds, e.g. barnyard grass, perennial weeds, e.g. field horsetail or cogon grass, miscellaneous shrubs, e.g. Rubus crataegifolis Bunge or Japanese beech, aquatic plants, e.g. duckweed, applicable in any period. Usable by treating miscellaneous trees and plants in the autumn to prevent the germination in next spring, at a lower concentration than as herbicides. n PROCESS: A compound of formula II: (R 1 is amino-protecting group; R 2 is phosphoric acid-protecting group) or its active carboxylic acid derivative is reacted with a compound of formula III: (R 3 is H or carboxylic acid-protecting group) to form a compound of formula IV. The amino-, carboxylic acid-, and phosphoric acid- protecting groups are removed to give the objective compound of formula I. n COPYRIGHT: (C)1980,JPO&Japio |