Phosphane-Catalyzed Knoevenagel Condensation: A Facile Synthesis ofα-Cyanoacrylates andα-Cyanoacrylonitriles
作者:Jhillu S. Yadav、Basi V. Subba Reddy、Ashok K. Basak、Boddapati Visali、Akkirala Venkat Narsaiah、Kommu Nagaiah
DOI:10.1002/ejoc.200300513
日期:2004.2
Triphenylphosphane (TPP) has been utilized as a novel and efficient catalyst for the Knoevenagelcondensation of aldehydes with acidic methylene compounds such as ethyl cyanoacetate and malononitrile to afford substituted olefins. The reaction proceeds smoothly under mild and solvent-free conditions and the products are obtained in excellent yields with an E-geometry. This method is applicable for
Copolymerizable methine and anthraquinone compounds and articles containing them
申请人:Pearson Clay Jason
公开号:US20060115516A1
公开(公告)日:2006-06-01
This invention relates to polymerizable ultraviolet light absorbers and yellow colorants and their use in ophthalmic lenses. In particular, this invention relates to polymerizable ultraviolet light absorbing methine compounds and yellow compounds of the methine and anthraquinone classes that block ultraviolet light and/or violet-blue light transmission through ophthalmic lenses.
Fully-occupied Keggin type polyoxometalate as solid base for catalyzing CO<sub>2</sub> cycloaddition and Knoevenagel condensation
作者:Weilin Ge、Xiaochen Wang、Lingyu Zhang、Lei Du、Yu Zhou、Jun Wang
DOI:10.1039/c5cy01038a
日期:——
The highly negatively charged alkaline Keggin type polyoxometalate (POM) Na16[SiNb12O40]·xH2O (NaSiNb12) was synthesized and used as an efficient solid base catalyst for CO2 cycloaddition and Knoevenagel condensation reactions. This is the first report of the basicity of a fully-occupied POM with the Keggin type structure. Theoretical calculations by the density functional theory (DFT) method revealed
合成了带负电的碱性Keggin型多金属氧酸盐(POM)Na 16 [SiNb 12 O 40 ]· x H 2 O(NaSiNb 12),并用作CO 2环加成和Knoevenagel缩合反应的有效固体碱催化剂。这是关于具有Keggin类型结构的完全使用的POM的基础性的第一份报告。通过密度泛函理论(DFT)方法进行的理论计算表明,[SiNb 12 O 40 ] 16-中氧原子的负负NBO(自然键轨道)电荷高(-0.919--1.029),表明存在碱性。被CO确认2- TPD和在POM固体上吸收的甲醇的原位FT-IR光谱。催化测试表明,POM固体碱在催化异质Knoevenagel缩合反应方面非常有效,对多种底物具有很高的转化率和选择性。在不存在任何溶剂或助催化剂的条件下,在相对温和的条件下(120°C,1 MPa),催化剂NaSiNb 12在将CO 2环化成环氧氯丙烷中也表现出很高的活性。该
First Example of Organocatalysis by Polystyrene-Supported PAMAM Dendrimers: Highly Efficient and Reusable Catalyst for Knoevenagel Condensations
作者:G. Rajesh Krishnan、Krishnapillai Sreekumar
DOI:10.1002/ejoc.200800516
日期:2008.10
This paper describes the first use of polystyrene-supported poly(amidoamine) (PAMAM) dendrimers as heterogeneous basic organocatalysts for carbon–carbon bond formation. Polystyrene-supported PAMAM dendrimers of first, second and third generations have been used as reusablebasecatalysts in Knoevenagel condensations of carbonyl compounds with active methylene compounds. The reactions proceed in short
Condensation of Ethyl Cyanoacetate with Aromatic Aldehydes in Water, Catalyzed by Morpholine
作者:Marcelo N. Gomes、Cecília M. A. de Oliveira、Clévia F. D. Garrote、Valéria de Oliveira、Ricardo Menegatti
DOI:10.1080/00397910903531771
日期:2010.12.21
Synthesis of (E)-ethyl 2-cyano-3-phenylacrilate derivatives in water catalyzed by morpholine was investigated. The reactions were performed under green chemistry conditions.