Fluoroglycofen-ethyl

Diphenyl ethers are both systemic and contact herbicides and are used for the selective control of annual broad-leaved weeds and grasses in a variety of crops (such as soybeans, maize, rice, wheat, barley, peanuts, cotton, onions and ornamental trees) under different application scenarios. This class of herbicides contains a diphenyl ether moiety as the core substructure. Acifluorfen, bifnox, chlomethoxyfen, chlorni-trofen, fluoroglycofen-ethyl and fomesafen, etc., are representative compounds of the diphenyl ether herbicides (Figure 1). 

Bifenox, fluoroglycofen-ethyl, HC-252, lactofen, and oxyfluorfen have analogous structures and modes of action. The carboxyl group may be replaced by an ether group or an ester, and many other herbicides with related structures have been developed. Tetrapyrrol and protoporphyrin accumulate, act as photosensitizers, and cause photooxidation and necrosis. They are contact herbicides and are more active in strong sunlight. 

Fig. 1 Photograph taken with a videodensitometer of a Whatman Multi-K SC5 plate showing the 2-D separation of a 16-component mixture of pesticides. The fluorescence-quenched zones are outlined for clarity. Direction 1 ethyl acetate-diisopropyl ether (2.5 97.5) mobile phase on the 20 cm x 3 cm K5F silica gel strip (normal phase TLC) direction 2 acetonitrile-water (85 15) on the adjacent 20 cm x 17 cm C-18F bonded silica gel layer (RPTLC). X Origin. Pesticides 1, propaquizafop 2, quizalofop-P 3, triadimefon 4, triadimenol 5, fenoxycarb 6, quinoxyfen 7, cyromazine 8, oxyfluorfen 9, fluoroglycofen 10, acetochlor 11, metazachlor 12, piperonyl butoxide 13, fur-alaxyl 14, pyriproxyfen 15, buprofezin 16, clofentezine. Source From Separation of a mixture of pesticides by 2D-TLC on two-adsorbentlayer Multi-K SC5 plate, in J. Liq. Chromatogr. Relat. Technol. with permission of Marcel Dekker, Inc.

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