New Applications of Solid Silica Chloride (SiO 2 -Cl) in Organic Synthesis. Efficient Preparation of Diacetals of 2,2-Bis(Hydroxymethyl)-1,3-propanediol from Different Substrates and Their Transthioacetalization Reactions. Efficient Regeneration of Carbonyl Compounds from Acetals and Acylals
application of solid silica chloride, an easily available and efficient catalyst for the preparation of diacetal of 2,2-bis-(hydroxymethyl)-1,3-propanediol from aldehydes, acetals, acylals, and oximes, is described. Transthioacetalization of diacetals of 2,2-bis-(hydroxymethyl)-1,3-propanediol into their corresponding 1,3-dithianes and 1,3-dithiolanes in the presence of silica chloride is presented. Efficient
Catalytic application of sulfamic acid-functionalized magnetic Fe<sub>3</sub>O<sub>4</sub> nanoparticles (SA-MNPs) for protection of aromatic carbonyl compounds and alcohols: experimental and theoretical studies
作者:Sepideh Khaef、Mohammad Ali Zolfigol、Avat Arman Taherpour、Meysam Yarie
DOI:10.1039/d0ra09087e
日期:——
Protection techniques of functional groups within the structure of organic compounds are important synthetic methods against unwanted attacks from various reagents during synthetic sequences. Acetal and thioacetal groups are well known as protective functional groups in organic reactions. In this study, acetalization of carbonyl compounds with diols and dithiols and methoxymethylation of alcohols with
有机化合物结构内官能团的保护技术是重要的合成方法,可防止合成过程中各种试剂的不必要的攻击。众所周知,缩醛和硫缩醛基团是有机反应中的保护性官能团。在这项研究中,使用氨基磺酸功能化磁性Fe 3 O 4纳米粒子(SA-MNPs)作为非均相固体酸催化剂,进行了羰基化合物与二醇和二硫醇的缩醛化以及醇与甲醛二甲基缩醛(FDMA)的甲氧基甲基化。产品通过 FT-IR 和 NMR 光谱进行表征。一些产品的结构和电子特性是通过量子力学(QM)方法计算的。根据计算结果获得的立体化学和电子性质,我们认为超共轭在2-苯基-1,3-二氧戊环衍生物的结构性质以及2-苯基-1,3-二氧戊环衍生物的π电子之间的电子转移中起着关键作用。具有S原子3d轨道的芳香环影响2-苯基-1,3-二噻烷衍生物的结构。
Synthesis of Diacetals from Aldehydes and Ketones with Pentaerythritol Catalyzed by Silica Sulfate Under Microwave Irradiation
作者:Tong‐Shou Jin、Huan‐Xin Wang、Kai‐Fang Wang、Tong‐Shuang Li
DOI:10.1081/scc-200026658
日期:2004.1.1
Abstract The synthesis of diacetals from pentaerythritol with aldehydes and ketones is carried out undermicrowaveirradiation in 80–98% yields with silica sulfate as catalyst.
摘要 季戊四醇与醛和酮合成二缩醛是在微波辐射下以硫酸硅为催化剂以 80-98% 的产率进行的。
Acetalization of Carbonyl Compounds as Pentaerythritol Diacetals and Diketals in the Presence of Cellulose Sulfuric Acid as an Efficient, Biodegradable and Reusable Catalyst
作者:Hamid Reza Shaterian、Fatemeh Rigi
DOI:10.1002/cjoc.201280002
日期:2012.3
This paper reports a practical and green method for the acetalization of carbonylcompounds as pentaerythritoldiacetals and diketals derivatives using cellulosesulfuricacid as a biodegradable and reusable solid acidcatalyst under thermal solvent‐free conditions.
Montmorillonite Clays Catalysis. Part 12.1 An Efficient and Practical Procedure for Synthesis of Diacetals from 2,2-Bis(hydroxymethyl)propane-1,3-diol with Carbonyl Compounds
作者:Zhan-Hui Zhang,、Tong-Shuang Li、Tong-Shou Jin、Ji-Tai Li
DOI:10.1039/a803046d
日期:——
Preparation of diacetals from 2,2-bis(hydroxymethyl)propane-1,3-diol with aldehydes and ketones is catalysed by montmorillonite clays in refluxing benzene or toluene in good to excellent yield.