Sulfur derivatives of 2-oxopropanal oxime as reactivators of organophosphate-inhibited acetylcholinesterase in vitro: synthesis and structure-reactivity relationships
(CH3)2S+, respectively, and have the same E configuration as the parent 2-oxopropanal oxime 1a (R = H, MINA). The pKa values range from 6.54 (1e) to 8.16 (1b), as compared with 8.30 for 1a. Rates of reaction (kappa 1) with 4-nitrophenyl acetate indicate that the oximate anions have a much higher nucleophilicity than common oxyanions of similar basicities: the alpha effects measured for 1a-e are of the order