Acid Chloride Synthesis by the Palladium-Catalyzed Chlorocarbonylation of Aryl Bromides
作者:Jeffrey S. Quesnel、Laure V. Kayser、Alexander Fabrikant、Bruce A. Arndtsen
DOI:10.1002/chem.201500476
日期:2015.6.22
palladium‐catalyzed method to synthesize acidchlorides by the chlorocarbonylation of aryl bromides. Mechanistic studies suggest the combination of sterically encumbered PtBu3 and CO coordination to palladium can rapidly equilibrate the oxidative addition/reductive elimination of carbon–halogen bonds. This provides a useful method to assemble highly reactive acidchlorides from stable and available reagents
我们报告了钯催化的芳基溴化物的氯羰基化合成酰氯的方法。机理研究表明,空间受限的P t Bu 3和CO配位与钯的结合可以快速平衡碳-卤素键的氧化加成/还原消除。这提供了一种有用的方法,可以用稳定的和可用的试剂组装高反应性的酰氯,并且可以与随后的亲核反应偶联,以生成新的羰基化产物类别。
N‐Heterocyclic Carbene Catalyzed Ester Synthesis from Organic Halides through Incorporation of Oxygen Atoms from Air
Oxygenation reactions with molecular oxygen (O2) as the oxygen source provides a green and straightforward strategy for the construction of O‐containing compounds. Demonstrated here is a novel N‐heterocyclic carbene (NHC) catalyzed oxidative transformation of simple and readily available organic halides into valuable esters through the incorporation of O‐atomsfromO2. Mechanistic studies prove that
This disclosure is related to photo-stable chromophores which are useful in various applications. Chromophores disclosed herein include a bis-triazole core, two electron-donors at C-4 and C-8, and two groups derived from pentaerythritol (R═OR
5
) or 1,1,1-tris(hydroxymethyl)methane (R═H) at N-2 and N-6. Such structures have been proven to have greater then five times higher photo-stability than their analogs with simpler alkyl groups at N-2 and N-6.