نتایج جستجو برای: gewald reaction
تعداد نتایج: 412409 فیلتر نتایج به سال:
The reaction of arylidenemalonodinitriles 1 with 1-arylethylidenemalonodinitriles 2 gives rise to sub stituted cyclohexadiene derivatives 3 which then undergo elimination of hydrogen cyanide and afford 3,5-diaryl-2,6-dicyano-aminobenzenes 4. This reac tion is a modification of more general dimerization reaction involving ylidenemalonodinitriles synthe sized from a variety of ketones. These t...
Novel thieno[2,3-d]pyrimidines containing a cyclohexane ring fused with a six- or five-membered heterocyclic moiety along with a benzylic nitrile were designed as potential inhibitors of PDE4. Expeditious synthesis of these compounds was carried out via a multi-step sequence consisting of a few key steps such as Gewald reaction, Dieckmann type cyclisation and Krapcho decarboxylation. This newly...
abstract in aggregate, active forms of reactive silica with mineral names are sometimes associated with sand and gravel in concrete mixture. alkali hydroxides originated from alkalis in the cement or other resources form an alkaline silica gel with this reactive silica which becomes swallowed and expanded during time causing damage to concrete. there have been growing researches on alkaline r...
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