Trifluralin

Trifluralin has been marketed since 1961. It is a selective soil herbicide that acts by entering the seedlings in the hypocotyl region and disrupting cell division. It adsorbs in the soil and so is resistant to leaching, having a long residual activity. Trifluoralin is much more stable under aerobic than anaerobic 

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The herbicide tnflurahn is prepared by the following sequence of reactions Identify com pound A and deduce the structure of trifluralin... 

Observing the amount and variety of pesticides analyzed by GC chromatography we decided to observe 14 of the most represented pesticides Prometryn, Deltamethrin, Fenitrothion, Tebuconazole, Buprofezin, Malathion, Myclobutanyl, Atrazine, Acetochlor, Bifenthrin, Alachlor, Pendimethalin, Dichlonuid and Trifluralin. 

Figure 3 Loads of simazine, trifluralin, and j -HCH (tonnes/year) entering the North Sea from England and Wales during 1990-94...

FLEXOMER , resins (olefin copolymers), 69 Flexsys N.V., 144 FLORA , trifluralin, 69... 

Precious Metals Australia Ltd. (PMA), 142 Precious Metals Coiporation, 244 Precious Metals Division, 211 PREMARIN , conjugated estrogen. 111 PREMERLIN 600 CL , trifluralin, 111 PREMPHASE , conjugated estrogen, 111 PREMPRO , conjugated estrogen, 111... 

Tricliloro-l, 2,2-trifluoroethane, 132 Tricresyl phosphates, 132 Tricyclohexyltin hydroxide, 132 Triethyl aluminum, 132 Triethylamine, 132 Triethyl phosphite, 132 Trifluorobromomethane, 132 Trifluoroethane, 132 Trifluoromethane, 132 Trifluralin, 132 Triisobutyl aluminum, 133 Trikem SA, 146... 

The chromatogram zones produced were brown for oryzalin (migration distance 4-6 mm) and nitralin (10-15 mm), yellowish-brown for dinitramin (18-22 mm) and isopropalin (58-62 mm), blue for pendimethalin (38-42 mm), violet for butralin (43-48 mm), red for fluchloralin (50-55 mm) and orange for trifluralin (65-70 mm) the background was colorless (Fig lA). 

The chromatogram was then placed in a twin-trough chamber with ca. 10 ml ammonia solution (25%) to increase the sensitivity. Afterwards the chromatogram zones were red in the case of oryzalin, nitralin, dinitramin, pendimethalin, butralin and fluchloralin and yellowish-brown in the case of isopropalin and trifluralin (Fig. IB). The detection sensitivity was sometimes increased and sometimes decreased (Table 1). 

Fig I Chromatogram of 2,6-dinitroaniline herbicides after treatment with the reagent sequence (A) and after additional treatment with ammonia vapor (B) 1 = oryzalin, 2 = nitralin, 3 = dinitramin, 4 = pendimethalin, 5 = butralin, 6 = fluchloralin, 7 = isopropalin, 8 = trifluralin, M = mixture. 

Fig. II Reflectance scans of a chromatogram track with 200 ng g each of oryzalin (1), nitralin (2), pendimethalin (4), butralin (5), fluchloralin (6), isopropalin (7), trifluralin (8) and of 1000 ng dinitramin (3), per chromatogram zone measurement at k = 460 nm (A), 580 nm (B) and 490 nm (C) X = dipping fronts.

Disruption of cell division Examples include trifluralin Hassall (1990) ... 

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