Polymorphism is playing a more important role in revealing the relationships between intermolecular arrangement, stacking and optical properties of luminogens, however, obtaining of polymorphism depends more on luck and accident. Here, two isomers named as 1APPA and 2APPA were designed and synthesized by furnishing twisted cyanostilbene backbone with planar anthracene unit. The two luminogens show
Rose bengal photocatalyzed Knoevenagel condensation of aldehydes and ketones in aqueous medium
作者:Anupam Das、K. R. Justin Thomas
DOI:10.1039/d2gc01402e
日期:——
Knoevenagel condensation is widely used in organic synthetic chemistry and several reaction conditions have been demonstrated. These reactions in neutral medium are challenging. In this report, we present a sustainable and greener method for Knoevenagel condensation reaction between carbonyl compounds (both aldehydes and ketones) and active methylene compounds using rose bengal as a photosensitizer
Chemoselective α-Alkylation and α-Olefination of Arylacetonitriles with Alcohols <i>via</i> Iron-Catalyzed Borrowing Hydrogen and Dehydrogenative Coupling
borrowing hydrogen or α-olefination by dehydrogenativecoupling methods. Designing and developing high-performance earth-abundant catalysts that can procure different products from the same starting materials remain a great challenge. Herein, we report an iron(0) catalyst system that achieves chemoselectivity between borrowing hydrogen and dehydrogenativecoupling protocols by simply changing the base. A
α-烷基腈和α-烯烃腈在有机合成和药物化学中非常重要。然而,不同类型的催化剂用于通过借氢实现腈的α-烷基化或通过脱氢偶联方法实现α-烯烃化。设计和开发高性能的地球丰富的催化剂,可以从相同的起始材料中获得不同的产品仍然是一个巨大的挑战。在此,我们报告了一种铁 (0) 催化剂系统,该系统通过简单地改变碱基来实现借氢和脱氢偶联方案之间的化学选择性。广泛的腈类和醇类,包括苄醇、直链脂肪醇、脂环醇、杂环醇和烯丙醇,被选择性且有效地转化为相应的产物。机理研究表明反应机理通过脱氢途径进行。这种铁催化方案对环境无害且原子效率高,可释放 H2和 H 2 O 作为绿色副产物。
Buckley et al., Journal of the Chemical Society, 1947, p. 1507
作者:Buckley et al.
DOI:——
日期:——
Meyer,V.; Frost, Justus Liebigs Annalen der Chemie, 1889, vol. 250, p. 161