A number of 2-p-nitrophenoxy-1, 3, 2-dioxaphospholane 2-oxides and-dioxaphosphorinane 2-oxides have been prepared and examined for alkaline hydrolysis and anticholinesterase activity. Although the six-membered ring dioxaphosphorinane 2-oxides and the acyclic analog diethyl p-nitrophenpl phosphate (paraoxon) gave comparable rates of liberation of p- nitrophenol in aqiieons NaOH, the cyclic esters were almost void of anticholinesterase ...
