Enol-phosphorous esters of 2-aryl-1,3-cycloalkanediones compounds

Compounds of the formula:

• ##STR43## wherein:
• R.sub.1 is hydrogen alkyl, haloalkyl, halogen or polyhaloalkyl substituent;
• R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are individually hydrogen, nitro, polyhaloalkyl, halogen, cyano, alkyl, alkoxy, alkylthio, alkylsulfinyl, alkylsulfonyl, alkanoyl, amido, amino or haloalkyl group;
• A is an alkylene or alkenylene chain containing two to three carbon atoms which may be substituted by one or more substituents which may be the same or different selected from:
• (a) substituents containing from 1 to ten aliphatic carbon atoms selected from alkyl, alkenyl, cycloalkyl or cycloalkenyl groups, which groups can be further substituted with one or more cyano, halogen, nitro alkoxy, aryloxy, alkylthio, arylthio, alkylsulfinyl, arylsulfinyl, alkylsulfonyl, acylamido, or dialkylamino substituents in any combination;
• and a phenyl group which can be substituted by one or more alkyl, alkenyl, cycloalkyl, cycloalkenyl, cyano, halogen, nitro, alkoxy, aryloxy, alkythio, arylthio, alkylsulfinyl, arylsulfinyl, alkylsulfonyl, arylsulfonyl acylamido or dialkylamino substituents in any combination, or
• (b) a divalent alkylene or alkenylene group having from 2 to 20 carbon atoms completing a 3, 4, 5, 6 or 7 membered carbon ring;
• wherein the said formed six-membered ring may optionally be aromatic.
• X.dbd.O or S
• R.sub.6 and R.sub.7 may be the same or different and individually can be, alkoxy, alkylthio, halogen, alkylthioalkyl, alkylsulfinyl, alkylsulfonyl, dialkylamino, cycloalkyl, alkyl up to 8 carbons, phenyl or phenoxy;
• with the proviso that R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 individually may not include more than ten aliphatic carbon atoms.