重组表面易斯对FAU热带石通过N兴奋剂通过N兴奋剂来提高多二烯侧链化性能
Zhe Hong1, Xin Wang1, Yingsen Fang1
1College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
Inorganic chemistry
|February 6, 2024
概括
在修饰的X泽奥利特 (CsX) 中的兴奋剂增强了从多醇基化中形成的 styrene 单体. 这种N-化催化剂 (CsX-BN-600) 显著提高了烯生产率和选择性,提供了优越的催化途径.
科学领域:
- 不同质的催化剂.
- 热带石的化学结构
- 有机合成 有机合成
背景情况:
- 通过用甲醇对二烯侧链基化生产烯单体是具有挑战性的.
- 有效的催化需要精确控制易斯酸基部位的化物.
- 修饰的X化石 (CsX) 是一个潜在的催化剂,但它的性能需要优化.
研究的目的:
- 制定一项战略,用于重组CsX热石中的易斯酸对.
- 调查 (N) 兴奋剂对CsX的催化性能的影响.
- 为了提高烯基化中的 styrene 形成率和选择性.
主要方法:
- 在修饰的X化物 (CsX) 的框架中化,以创建CsX-BN-600催化剂.
- 修改后的焦石表面酸性质的表征.
- 测试基因CsX和N-化CsX-BN-600的催化活性和选择性,用甲醇基化二烯侧链.
主要成果:
- 与原始CsX相比,N-doped的CsX-BN-600催化剂的 styrene形成率是原始CsX的2.7倍.
- 对烯的选择性显著改善,从CsX的70.1%提高到CsX-BN-600的85.7%.
- N兴奋剂引入了新的易斯基点,并通过电子捐赠优化了现有的易斯基点,创造了丧的易斯对 (FLP).
结论:
- 兴奋剂是一种有效的策略,可以精确调节CsX热中易斯酸基对.
- 在CsX-BN-600中,优化的催化位点和挫败的易斯对对是加强烯生产的原因.
- 这种无N兴奋剂的方法为改善工业应用中诸如 styrene 合成中的热酸盐催化剂提供了一个有前途的途径.
相关概念视频
01:33Carboxylic Acids to Methylesters: Alkylation using Diazomethane
2.2K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
2.2K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.2K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.2K
01:17Ziegler–Natta Chain-Growth Polymerization: Overview
3.3K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.3K
00:55Nitriles to Amines: LiAlH4 Reduction
3.4K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
3.4K
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
18.1K
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
18.1K
03:08Hydroboration-Oxidation of Alkenes
8.2K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
8.2K