Bromo- and bromochloro-polynuclear aromatic hydrocarbons, dioxins and dibenzofurans in municipal incinerator fly ash.

A fly ash sample found to contain polychlorinated dioxins and dibenzofurans was analyzed for brominated analytes. Bromochloro-polynuclear aromatic hydrocarbons, dioxins and dibenzofurans, as well as bromo PAH were found in ppt to ppb concentrations. Analytical results were confirmed by high-resolution mass spectrometric accurate mass determinations and by tandem mass spectrometry.

Correlation of structure with retention index for chlorinated dibenzo-p-dioxins.

The method presented here allows calculation of the retention indices for the chlorinated dibenzo-p-dioxins under a specific set of experimental conditions, using a limited data set. This technique provides a simple way to obtain retention index data for those isomer standards not readily available. Thus, the technique can aid in structure assignment of specific congeners whether obtained from synthesis or found in environmental monitoring efforts.

Synthesis of 5-substituted aminomethyluracils via the Mannich reaction.

An extension of the Mannich reaction, in which aminomethylation of the five position of uracil, is reported. Thus, primary and secondary alkylamines and primary aromatic amines containing ring-activating groups led to the title compounds 3-10. Compound 11 in which the aromatic ring contains the ring-deactivating nitro group was synthesized in an alternative way.