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Showing 1 to 5 of 5 for “"hexamethylphosphoramide"”.
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Anionic polymerization of a series of cyclocarbosiloxanes
… EM-360 Nuclear Magnetic Resonance Spectrometer. Hexamethylphosphoramide (HMPA) was used as a promoter to solvate the initiator ions and thus increasing the polymerization rate. It was found that water present in the system decreased the polymerization rate and brought about a decrease in the …
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Retro-Diels-Alder routes to 4,5 disubstituted cyclopentenones
… Even in the presence of strong cation solvating hexamethylphosphoramide (HMPA) (±30% co-solvent), lithium enolates proved inert. However, trapping the magnesium enolate generated from the 1, 4-addition of n-butylmagnesium bromide to tricyclodecadienone with aldehydes yielded β-ketols of syn and …
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Preparation of N,N'-Dialkyl bis(diamino) diphenylmethanes and N,N'-Dialkyl bis(diamino) benzophenones: preparation of B-hydroxy sulfonamides and B-hydroxy sulfinamides
… 2.2 equivalents of dry potassium hydroxide in hexamethylphosphoramide at 75°, followed by addition of 2.2 equivalents of alkylating agent (methyl iodide, ethyl iodide, and benzyl chloride) to afford 70-84% of the alkylated sulfonamides. Subsequently the N,N'-dialkylsulfonamides were cleanly …
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Quantum chemical modeling of redox reactivity, degradation pathways and persistence for aqueous phase contaminants
… pathways as well as contaminant persistence. Hexamethylphosphoramide (HMPA), a widely used solvent and poorly characterized groundwater contaminant, is used as a test case. The development of an analytical technique based on liquid chromatography / time-of-flight mass spectrometry enables the …