Synthesis of dimethyl derivatives of imidazolinone herbicides: Their use in efficient gas chromatographic methods for the determination of these herbicides

The dimethyl derivatives of imazaquin, imazapyr, imazmethapyr, imazethapyr, 2-[4,5 dihydro-1,4-dimethyl-4-( 1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-m ethoxymethyl-3-pyridine carboxylic acid, 2-[4,5-dihydro-1,4 -dimethyl-4-(1- methylethyl)-5-oxo-1H-imidazol-2-yl]-4-methyl benzoic acid, and 2-[4,5-dihy dro-1,4-dimethyl-4-(l-methyl ethyl)-5-oxo- 1H-imidazol-2-yl]-5-methyl benzo ic acid were prepared and fully characterized. The availability of these de rivatives has led to the development of efficient and multiresidue gas chro matographic methods for trace level analysis of imidazolinone herbicides in matrixes such as water, soybean, and soil.