高效且具有成本效益的固体基CaO-MgO催化剂,用于在水中的Knoevenagel冷凝,具有良好的E因子
Siddarama Goud Bandalla1,2, Nagaraju Kerru3, Swathi Thangalipalli4
1Department of Pharmaceutical Chemistry, Telangana University, Nizamabad 503322, India.
ACS omega
|August 18, 2025
概括
一种新型的二元金属氧化物催化剂有效地促进了水中的Knoevenagel凝结反应. 这种环保的方法产生了高纯度和可回收的有价值的不和化合物.
科学领域:
- 绿色化学 绿色化学
- 催化剂是一种催化剂.
- 有机合成 有机合成
背景情况:
- 诺韦纳格尔凝结 (KC) 是合成α,β不和化合物的关键反应.
- 开发高效,具有成本效益和环保的KC反应催化剂,特别是在水性介质中,仍然是一个重大挑战.
- 固基催化剂在分离和可回收性方面比同质催化剂具有优势.
研究的目的:
- 开发和评估一种新的,具有成本效益和生态兼容的二元金属氧化物 (BMO-1),作为Knoevenagel凝结反应的固基催化剂.
- 为了研究BMO-1在室温的水性介质中的催化性能,对各种类型的化物和活性甲试剂进行研究.
- 探索并联反应,并优化潜在升级的条件.
主要方法:
- 通过超稀释共沉合成二元金属氧化物催化剂 (BMO-1,BMO-2,BMO-3,BMO-4).
- 使用XRD,BET,CO2-TPD,FT-IR,SEM,EDX和TEM进行催化剂的表征.
- 在优化条件下对Knoevenagel凝结反应 (包括合反应) 的催化活性进行评估,并与空白试验进行比较.
主要成果:
- BMO-1 (1CaO-1.5MgO) 显示出优越的催化活性,这归因于其高表面积 (97.6 m2/g),表面基本性 (152.4 μmol/g) 和小颗粒大小 (16.9 nm).
- 催化剂有效地产生了31种α,β不和化合物,包括9种新型化合物,在室温水中具有良好的E因子,具有高纯度.
- BMO-1在最多五个循环中表现出稳定性和可回收性,耗尽的催化剂分析提供了关于停用的见解.
结论:
- 开发的BMO-1催化剂是一种高效,具有成本效益和生态兼容的固基催化剂,用于水性介质中的Knoevenagel凝结反应.
- 该研究强调了BMO-1在合成各种α,β不和化合物的潜力,包括复杂的并联反应.
- 建立了升级的最佳条件,证明了这种催化系统的实际适用性.
相关概念视频
Aldol Condensation with β-Diesters: Knoevenagel Condensation
3.2K
The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
3.2K
Acid-Catalyzed Hydration of Alkenes
15.0K
Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
15.0K
Factors Affecting α-Alkylation of Ketones: Choice of Base
3.3K
α-Alkylation of ketones is achieved in the presence of alkyl halides and a base. The reaction proceeds via the formation of an enolate ion followed by nucleophilic substitution. The choice of base employed is essential as it is the key factor in determining the reaction outcome.
The reaction involving bases like EtO− whose conjugate acid EtOH (pKa = 15.9) is stronger than the ketone (pKa = 19.2) results in an equilibrium mixture with higher ketone concentration. As a consequence,...
The reaction involving bases like EtO− whose conjugate acid EtOH (pKa = 15.9) is stronger than the ketone (pKa = 19.2) results in an equilibrium mixture with higher ketone concentration. As a consequence,...
3.3K
Aldehydes and Ketones with Water: Hydrate Formation
3.5K
An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
3.5K
Aldehydes and Ketones to Alkanes: Wolff–Kishner Reduction
4.7K
Wolff–Kishner reduction involves converting aldehydes and ketones to alkanes using hydrazine and a base. The reaction converts a carbonyl group to a methylene group. The method was independently discovered by N. Kishner in 1911 and L. Wolff in 1912. The reduction is carried out in high-boiling solvents such as ethylene glycol and diethylene glycol because heat is required to deprotonate the N–H proton in one of the reaction steps. ...
4.7K
Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration
9.1K
Introduction
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.
9.1K


