28694-04-4Relevant academic research and scientific papers
Preparation method of 1,4- dibenzylidene malonic ester (by machine translation)
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Paragraph 0033-0034, (2019/12/11)
The preparation method comprises the following 1,4 - steps: dissolving the terephthalaldehyde and the malonate of the formula in 1 an organic solvent; reacting 2 under the action of a catalyst; and after the reaction is 20 - 80 °C complete, the method comprises the following 3 steps 1,4 - reacting with organic acid and organic base; and reacting the reaction route as follows. In-flight vehicle R1 Sum-up table R2 An alkyl, alkenyl or 1 - 18 alkynyl group is independently selected from alkyl, alkenyl or alkynyl groups containing from about. The method provided by the invention is simple in process, short in flow, mild in reaction conditions, high in conversion rate, and capable of recycling and recycling auxiliary materials such as solvents. (by machine translation)
Sulfuric acid-modified PEG-6000 (PEG-OSO3H): A biodegradable, reusable solid acid catalyst for highly efficient and eco-friendly synthesis of novel bis-Knoevenagel products under solvent-free conditions
Siddiqui, Zeba N.,Khan, Tabassum
supporting information, p. 3759 - 3764 (2013/07/05)
Sulfuric acid-modified PEG-6000 (PEG-OSO3H) is used as a highly efficient, biodegradable, and reusable acid catalyst for the synthesis of novel acyclic and heterocyclic bis-Knoevenagel products under thermal solvent-free conditions. The remarkable features of this green, new methodology are high conversions, cleaner reaction profile, simple experimental and work-up procedure, and economic viability. The catalyst is characterized for the first time by SEM-EDX and powder XRD. The catalyst can be reused several times without significant loss of its catalytic activity.
