DERIVATIVES OF N-TRIFLUOROACETYL N-PHOSPHONOMETHYLGLYCINE DICHLORIDE, THEIR PREPARATION AND THEIR USE AS HERBICIDES

摘要

This disclosure relates to N-trifluoroacetyl-N-phosphonomethylglycine dichloride derivatives and to herbicidal compositions containing same. The N-trifluoroacetyl-N-phosphonomethylglycine dichlorides are useful as post-emergent herbicides. The compounds of the present invention are characterised by the formula wherein R is chlorine, an alkoxy group containing from 1 to 10 carbon atoms, an alkoxyalkoxy group containing from 3 to 6 carbon atoms, an alkoxyalkoxyalkoxy group containing from 5 to 9 carbon atoms or a chloro lower alkoxy group. The herbicidal method of the present invention is characterised by applying a herbicidally effective amount of a compound characterised by the formula as shown above and wherein R is as defined above. The herbicidal composition of the present invention is characterised in that said composition comprises from about 5 to about 95 parts by weight of a compound characterised by the formula as shown above and wherein R is as defined above; the remaining parts being composed of one or more suitable carriers, diluents and/or adjuvants. Another aspect of the present invention is a process for the production of a compound of the present invention which comprises reacting a compound of the formula (HO)2-@-CH2-@-CH2@-R min wherein R min is hydroxy, an alkoxy group containing from 1 to 10 carbon atoms, an alkoxyalkoxy group containing from 3 to 6 carbon atoms, an alkoxyalkoxyalkoxy group containing from 5 to 9 carbon atoms or a chloro lower alkoxy group with trifluoroacetic anhydride at a temperature of from 10 DEG C to 35 DEG C and reacting the resulting product with thionyl chloride at reflux temperature.