نتایج جستجو برای: polyphosphoric acid
تعداد نتایج: 747445 فیلتر نتایج به سال:
E l S a y e d A f s a h , F a t h y A b d e l K a d e r A m e r a n d H a s s a n E t m a n Chemistry Department, Faculty of Science, Mansoura University, Mansoura, A. R. Egypt Z. Naturforsch. 84b, 502-506 (1979); received October 25, 1978 2-Cinnamoyl-1,3-indandione Derivatives A series of 2-cinnamoyl-l,3-indandiones (2a-e) were obtained by condensing 1 with aldehydes. Treatment of 2 a with hyd...
Condensation reactions of carboxylic acids and anilines in the presence of polyphosphoric acid trimethylsilyl ester (PPSE) afforded a range of sterically demanding N,N'-bis(aryl)amidines, RN{C(R')}N(H)R [R = Mes (Mes = 2,4,6-trimethylphenyl), R' = Cy (Cy = cyclohexyl) L¹H; R = Dipp (Dipp = 2,6-diisopropylphenyl), R' = Cy L²H; R = Mes, R' = Ph L³H; R = Dipp, R' = Ph L⁴H; R = Mes, R' = Dmp (Dmp =...
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