摘要 二硫缩醛化是一类众所周知的有机转化,通过 1,2-乙二硫醇/或 1 来保护多种芳香族化合物(具有释放电子和吸电子取代基)、杂芳香族和脂肪族醛以及酮。 ,3-丙二硫醇在 Fe 3 O 4 @MCM-41-GPTMS-Gu-Cu II NP存在下。在 Fe 3 O 4 @MCM-41-GPTMS-Gu-Cu II存在下化学选择性地获得了相应的 1,3-二硫杂环己烷和 1,3-二噻烷纳米颗粒具有六方核壳结构、超顺磁性,在温和的反应条件下平均粒径为8-25 nm。使用磁棒可以轻松地将纳米结构催化剂从反应混合物中分离出来,并在多次反应中重复使用,而不会显着降低其催化活性。接近中性的条件、良好至高的产物收率、操作简单、后处理程序容易、与各种官能团的相容性使得本方法除了已知的方法之外还有价值。
Poly(N-bromobenzene-1,3-disulfonamide) and N,N,N′,N′-tetrabromobenzene-1,3-disulfonamide as a mild and efficient catalyst for chemoselective thioacetalization of carbonyl functions and transthioacetalization reactions
Poly(N‐bromobenzene‐1,3‐disulfonamide) and N,N,N′,N′‐tetrabromobenzene‐1,3‐disulfonamide are effective catalysts for chemoselective dithioacetalization of aldehydes in the presence of ketones under neutral conditions. J. Heterocyclic Chem., (2011).
HIGH MOLECULAR WEIGHT ZWITTERION-CONTAINING POLYMERS
申请人:Oligasis
公开号:US20140024776A1
公开(公告)日:2014-01-23
The present invention provides multi-armed high MW polymers containing hydrophilic groups and one or more functional agents, and methods of preparing such polymers.
1,3-Dibromo-5,5-dimethylhydantoin (DBH) as a Mild and Efficient Catalyst for Chemoselective Thioacetalization of Carbonyl Compounds and Dethioacetalization Under Mild Conditions
bromide is an effective catalyst for chemoselectivethioacetalization of aldehydes in the presence of ketones under neutral conditions. In addition, a simple and efficient procedure for the deprotection of 1,3-dithianes and 1,3-dithiolanes of aromatic, aliphatic, and α,β-unsaturated aldehydes and ketones in solvent-free conditions to the corresponding parent carbonylcompounds was successfully carried
Mesoporous sBa-15 silica catalyst functionalized with phenylsulfonic acid groups (SbA-15-ph-So<sub>3</sub>h) as efficient nanocatalyst for chemoselective thioacetalization of carbonyl compounds
作者:Alireza Sedrpoushan、Habibollah Ghazizadeh
DOI:10.1080/17415993.2016.1257929
日期:2017.1.2
ABSTRACT In this research a Nano acidic catalyst was prepared and its efficiency on thioacetalization of carbonyl compounds was examined. For this aim we used modified SBA-15 as support, which have been modified by phenolic and sulfonic acid. SBA-15 is a member of mesoporouses. Mesostructures-based properties such as large specific surface, low specific weight, chemical and thermal resistance have