Highly efficient FeNP-embedded hybrid bifunctional reduced graphene oxide for Knoevenagel condensation with active methylene compounds,New Journal of Chemistry

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Highly efficient FeNP-embedded hybrid bifunctional reduced graphene oxide for Knoevenagel condensation with active methylene compounds
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020/01/15 , DOI: 10.1039/c9nj05821d
Dikin Patel _{1,

2,

3,

4,

5} , Ravi Vithalani _{1,

2,

3,

4,

5} , Chetan K. Modi _{1,

2,

3,

4,

5}

Affiliation

We have synthesized atypical highly active bifunctional FeNPs implanted on amino-modified reduced graphene oxide (FeNPs/Am@rGO) [where FeNPs = Fe nanoparticles; Am = Primary aromatic amine derivatives such as p-phenylenediamine (PPD) and/or aniline (AN)] as nanocatalysts via the acid–base dual-activation mechanism by introducing primary aromatic amines on the basal and/or edge sites of rGO that offer base characteristics and FeNPs anchored onto the surface of rGO that supply the Lewis acidic nature. These nanocatalysts were well corroborated through assorted physicochemical techniques. Impressively, FeNPs/Am@rGO significantly promoted a one-pot Knoevenagel condensation reaction with different aromatic aldehydes and active methylene compounds, thus bestowing excellent activity to give synthetically valuable multifunctional benzylidene derivatives. The impact of different parameters influencing the catalytic activity has also been monitored. Under the optimized conditions, FeNPs/PPD@rGO exclusively promoted the aforementioned reaction, leading to 100% benzaldehyde conversion with 100% yield of the product along with TON and TOF (h⁻¹) values of 350.8 and 100.2, respectively. Besides, it could be effortlessly recycled by centrifugation after each run and reused afterwards without significant loss in its catalytic activity in a six cycle test.

中文翻译：

嵌入FeNP的高效杂化双功能氧化石墨烯，用于Knoevenagel与活性亚甲基化合物的缩合反应

我们已经合成了非典型的高活性双功能FeNPs植入了氨基修饰的还原氧化石墨烯（FeNPs / Am @ rGO）[其中FeNPs = Fe纳米颗粒；Am =伯芳族胺衍生物，例如对苯二胺（PPD）和/或苯胺（AN）]作为纳米催化剂通过通过在提供基本特性的rGO的基础和/或边缘位点引入伯芳香胺，以及在rGO的表面上锚定的FeNPs来提供路易斯酸性，引入伯芳香胺，从而实现酸碱双活化机制。这些纳米催化剂通过各种物理化学技术得到了很好的证实。令人印象深刻的是，FeNPs / Am @ rGO显着促进了与不同芳族醛和活性亚甲基化合物的一锅Knoevenagel缩合反应，因此具有出色的活性，可提供具有合成价值的多功能亚苄基衍生物。还已经监测了不同参数影响催化活性的影响。在优化的条件下，FeNPs / PPD @ rGO专门促进了上述反应，^-1）的值分别为350.8和100.2。此外，它可以在每次运行后不费吹灰之力地通过离心回收，然后再使用，而在六循环试验中其催化活性没有明显损失。

更新日期：2020-02-17

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