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J Assoc Off Anal Chem. 1975 Nov;58(6):1294-1301.

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.

[Indexed for MEDLINE]

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