WebJun 1, 1998 · Conclusions Polyphosphate and polyphosphate ester having pendant tertiary amine salt groups in the side chains [13] were easily prepared from a cyclic organic … WebApr 15, 2001 · Alternate Names: polyphosphoric acid trimethylsilyl ester; PPSE. Solubility: sol dichloromethane, chloroform, 1,2-dichloroethane, benzene, toluene, xylene, 1,2 …

Polyphosphate ester Sigma-Aldrich

WebCondensation reactions of carboxylic acids and anilines in the presence of polyphosphoric acid trimethylsilyl ester (PPSE) afforded a range of sterically demanding N,N′ … WebThe esters could be converted to the corresponding 477-selenines by treatment with polyphosphoric acid trimethylsilyl ester (PPSE), a useful reagent for eliminations under neutral conditions. These 4/7-selenines were key intermediates in the synthesis of selenabenzenes. bivariate data consist of ordered pairs

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WebSep 1, 2007 · This review describes the composition, preparation and applications in organic synthesis of polyphosphoric acid trimethylsilylester (PPSE). It covers the literature since it … WebSep 6, 2007 · A discussion of the synthetic utility of PPSE, compared to other related reagents such as polyphosphoric acid (PPA) and polyphosphoric acid ethyl ester (PPE) as well as various Lewis acids, is ... WebFeb 12, 2004 · A series of m- and p-nitrophenyl esters of p-sulfophenylxanthine derivatives were synthesized as model compounds. The target xanthine derivatives were obtained in high yields by condensation of the appropriate 5,6-diaminouracils with 4-(nitrophenoxysulfonyl)benzoic acids in the presence of a carbodiimide, followed by ring … date first email internet