Herein, the first example of base‐metal‐catalyzed dehydrogenativecoupling of diols and amines to selectively form functionalized 1,2,5‐substituted pyrroles liberating water and hydrogen gas as the sole by‐products is presented. The reaction is catalyzed by pincer complexes of earth‐abundant cobalt.
[EN] ADDUCT BETWEEN A PYRROLIC COMPOUND AND AN INORGANIC OXIDE HYDROXIDE, A SUPER-ADDUCT BETWEEN A PYRROLIC COMPOUND, AN INORGANIC OXIDE HYDROXIDE AND A CARBON ALLOTROPE, ELASTOMERIC COMPOSITION COMPRISING THE SUPER-ADDUCT AND METHODS FOR PRODUCING THE SAME<br/>[FR] PRODUIT D'ADDITION ENTRE UN COMPOSÉ PYRROLIQUE ET UN HYDROXYDE D'OXYDE INORGANIQUE, UN SUPER-PRODUIT D'ADDITION ENTRE UN COMPOSÉ PYRROLIQUE, UN HYDROXYDE D'OXYDE INORGANIQUE ET UN ALLOTROPE DE CARBONE, COMPOSITION ÉLASTOMÈRE COMPRENANT LE SUPER-PRODUIT D'ADDITION ET LEURS PROCÉDÉS DE PRODUCTION
申请人:PIRELLI
公开号:WO2019162873A1
公开(公告)日:2019-08-29
Adduct obtainable by interacting: a. a pyrrolic compound of general formula (I) wherein the significance of the substituents is specified in the description and in the claims, and b. an inorganic oxide hydroxide, comprising an oxide and/or a hydroxide, wherein the ratio between the weight of said inorganic oxide hydroxide and said pyrrolic compound is greater than or equal to 10.
A New Green and Efficient Brønsted: Lewis Acidic DES for Pyrrole Synthesis
作者:M. Shaibuna、Letcy V. Theresa、K. Sreekumar
DOI:10.1007/s10562-018-2414-4
日期:2018.8
Deep eutectic solvents (DESs) are fluids composed of different Lewis or Brønsted acids and bases, generally acknowledged as new analogues to ionic liquids (ILs), because of their similar characteristics, but with more advantages related to preparation cost, environmental impact etc. Their preparation involve the simple mixing of two components generally with moderate heating that are inexpensive, non-toxic
深共熔溶剂 (DES) 是由不同的路易斯或布朗斯台德酸和碱组成的流体,通常被认为是离子液体 (IL) 的新类似物,因为它们具有相似的特性,但在制备成本、环境影响等方面具有更多优势。制备涉及两种组分的简单混合,通常在适度加热下进行,这些组分价格低廉、无毒、可生物降解,所得混合物能够克服常规有机溶剂和离子液体的缺点。与这些材料发生化学反应的危险性要小得多,它们既可以作为催化剂,也可以作为反应介质。在此,介绍了三种基于 ZrOCl2·8H2O 与尿素、乙二醇和甘油结合的新型 DES。物理化学性质,如相行为、凝固点、密度、粘度、测定在普通溶剂中的热稳定性和混溶性。此外,本文还介绍了一种测定具有 Brønsted 和 Lewis 位点的 DES 酸度的新方法。据报道,使用各种胺可以通过 Paal-Knorr 反应方便地合成吡咯,这些胺用于确定该催化剂在有机反应中的重要性。通过GC-MS、1H NMR和13C
Greener Paal-Knorr Pyrrole Synthesis by Mechanical Activation
A straightforward and solventless synthesis of pyrroles was developed by using mechanochemical activation and a biosourced organic acid as the catalyst. Relative to traditional Paal–Knorr methodologies, various N-substituted pyrroles were obtained in very short reaction times. By reaction with unreactive diketones, desymmetrized aliphatic and aromatic compounds were also synthesized.
通过使用机械化学活化和生物来源的有机酸作为催化剂,开发了一种简单且无溶剂的吡咯合成方法。相对于传统的 Paal-Knorr 方法,可以在很短的反应时间内获得各种 N 取代的吡咯。通过与不活泼的二酮反应,还合成了去对称的脂肪族和芳香族化合物。
609. The chemistry of carcinogenic nitrogen-compounds. Part III. Polysubstituted pyrroles and indoles as potential cocarcinogens