Showing papers on "Triphenyl phosphate published in 1982"

A carbon‐13 nuclear magnetic resonance spectral investigation of substituted triphenyl phosphates

Abstract: 13C NMR chemical shifts and 13C31P couplings are reported for triphenyl phosphate and 13 alkyl derivatives. In ortho-alkylated materials, it is found that the upfield γ shielding effect is only operative when the carbon atom, situated γ to the exocyclic oxygen, bears at least one hydrogen. Conformational changes about the arylO bond can be monitored via the vicinal 31pOC13C couplings.

Comparison of laboratory and field results for prediction of the environmental behavior of phosphate esters

Abstract: Two phosphate ester flame retardants, triphenyl phosphate (TPP) and 2-ethylhexyldi-phenyl phosphate (EHDPP) (both 14C-labelled) were added to two small artificial ponds (3 m3 volume) to give water concentrations of 60 μg/L for each compound. Both phosphate esters had half-lives of about 15 h in the water column and showed rapid sorption to bottom sediment. At 24 h posttreatment an estimated 28% of EHDPP and 9% of TPP added could not be accounted for by measurements of radioactivity in water, sediment and biota. Calculations of volatilization rates from water of the two compounds suggested that losses of EHDPP may have been due in part to volatilization. Bioconcentration of TPP by fathead minnows (Pimephales promelas) was similar to that predicted from laboratory studies on the uptake and clearance of TPP by rainbow trout (Salmo gairdneri). Prediction of the bioconcentration of EHDPP by duckweed (Lemna minor) from laboratory studies underestimated the rapid uptake of this compound observed in the ponds.

Process for the manufacture of alkyl diaryl phosphate esters

Abstract: Mixed phosphoric acid ester compositions containing less than 4 weight percent of a triaryl phosphate, from about 10 to about 20 weight percent of an aryl dialkyl phosphate and from about 65 to about 80 weight percent of an alkyl diaryl phosphate are prepared by heating a monohydric alcohol or alkoxy alcohol with a triaryl phosphate, such as triphenyl phosphate, in the presence of a catalytic amount of an alkali metal phenoxide, for example, potassium phenoxide. The mixed phosphoric acid ester composition may be separated from by-products of the reaction by distillation.