Imperial Chemical Industries Limited

David Rees Parry

David Cartwright

John M Cox

John E Barton

David J Collins

Alfred Glyn Williams

David A Griffin

Clive Dudley Tomlin

Diphenyl ethers of formula: ##STR1## wherein A is hydrogen or one of a specified range of substituents e.g. halogen, hydroxy, haloalkyl, B, C, E and F are hydrogen or specified substituents; D is CF.sub.3, halogen, or an other specified substituent; and R is a group --CONR.sup.4 SO.sub.2 R.sup.3 wherein R.sup.4 is hydrogen or C.sub.1 to C.sub.4 alkyl and R.sup.3 is an optionally substituted alkyl, alkenyl, alkynyl, or aryl radical; useful as selective herbicides.

Diphenyl ether carboxylic acids and salts and esters thereof useful as

Diphenyl ethers of formula: ##STR1## wherein A is hydrogen or one of a specified range of substituents e.g. halogen, hydroxy, haloalkyl, B, C, E and F are hydrogen or specified substituents; D is CF.sub.3, halogen, or another specified substituent; and R is a group --CONR.sup.4 SO.sub.2 R.sup.3 wherein R.sup.4 is hydrogen or C.sub.1 to C.sub.4 alkyl and R.sup.3 is an optionally substituted alkyl, alkenyl, alkynyl, or aryl radical; useful as selective herbicides.

Diphenyl ether herbicides

A process for the preparation of a compound of formula: ##STR1## wherein R is an amino, hydrocarbylamino or dihydrocarbylamino radical, the hydrocarbylamino and dihydrocarbylamino radicals being unsubstituted, or substituted in the hydrocarbyl moiety with atoms or radicals which do not interfere with the process and Z is an acyl radical which comprises the steps of:

Acetic acid derivatives and processes for their production

Process for the preparation of a compound of formula: ##STR1## WHEREIN N IS ZERO OR AN INTEGER FROM 1 TO 12 AND R.sup.1 and R.sup.2 are hydrogen or lower alkyl, which comprises the step of treating a mixture of a diketene of formula: ##STR2## and a strongly acidic medium selected from the group consisting of concentrated sulphuric acid and oleum with a compound of formula:

Process of preparing 2-amino-4-hydroxy-5(and/or 6)-alkyl substituted

A process of preparing the herbicide N-phosphonomethylglycine which comprises reacting an N-substituted glycine derivative of the formula: ##EQU1## wherein R.sup.1 is a hydrogen atom or an esterifying group, Ar is an aryl radical, and R.sup.2 and R.sup.3 each stand for a hydrogen atom or an aryl radical, with formaldehyde and phosphorous acid in an acidic aqueous medium to give an N-substituted N-phosphonomethylglycine derivative of the formula: ##EQU2## and thereafter reacting the said N-substituted N-phosphonomethylglycine with hydrobromic or hydriodic acid to remove the N-substituent, and recovering N-phosphonomethylglycine.

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Wokingham, United Kingdom

David Rees Parry