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ORGANOPHOSPHATE AND ORGANOPHOSPHOROTHIONATE ESTERS: APPLICATION OF LINEAR FREE ENERGY RELATIONSHIPS TO ESTIMATE HYDROLYSIS RATE CONSTANTS FOR USE IN ENVIRONMENTAL FATE ASSESSMENT
Citation:
Wolf, N. ORGANOPHOSPHATE AND ORGANOPHOSPHOROTHIONATE ESTERS: APPLICATION OF LINEAR FREE ENERGY RELATIONSHIPS TO ESTIMATE HYDROLYSIS RATE CONSTANTS FOR USE IN ENVIRONMENTAL FATE ASSESSMENT. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-80/206 (NTIS PB81148710).
Description:
Hydrolysis rate constants required for assessing the environmental fate of certain organophosphate and organophosphorothionate esters may be estimated by use of linear free energy relationships (LFERs). LFERs for the second-order alkaline rate constants and the pKa of the conjugate acid of the leaving groups were established for 0,0-diethyl-0-substituted phosphates and phosphorothionates. Also, the second-order alkaline hydrolysis rate constants of selected triaryl phosphates were correlated with the Hammett-sigma constants. Existing LFERs for diaryl phosphate ester anions along with monoaryl phosphate ester mono- and dianions were used to predict hydrolytic half-lives under reaction conditions that are characteristic of aquatic environments. (Copyright (c) Pergamon Press Ltd. 1980.)