Analysis of pesticides by chemical derivatization. I. a new procedure for the formation of 2-chloroethyl esters of ten herbicidal acids.
A new esterification procedure was developed to form 2-chloroethyl esters for 10 common herbicidal acids, using dicyclohexyl carbodiimide and 2-chloroethanol. This reagent was found to be more desirable than the commonly used boron trichloride/2-chloroethanol reagent. Maximum esterification was given for picloram at a lower reaction temperature with a shorter reaction time. Also, maximum esterification of dicamba and 2,3,6-TBA was achieved. The boron trichloride/2-chlorethanol gave poor or little esterification with these 2 acids under the various conditions investigated. The effect of solvents on esterification with the 2 reagents was also explored.
D055598:Chemical Phenomena; D002621:Chemistry; D004952:Esters / Q000032:analysis; D006540:Herbicides / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D012997:Solvents; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis
D004952:Esters; D006540:Herbicides; D007202:Indicators and Reagents; D012997:Solvents; D014874:Water Pollutants, Chemical