在这项研究中,首次合成了一种新的聚苯胺(PANI)衍生物,聚[2-(环己基-2-烯-1-基)苯胺]。通过改变合成参数表明,如果使用HNO 3和(NH 4)2 S 2 O 8,则可获得最高的聚合物产率。发现聚[2-(环己基-2-en-1-基)苯胺]的合成条件的变化导致光学性质的变化,例如,在HClO 4介质中和存在下获得的PANI衍生物。的(NH 4)2 S 2 O 8显示出最高的发光量子产率(0.05)。使用聚[2-(环己基-2-烯-1-基)苯胺]的热重分析法,确定了聚合物热降解的三个主要阶段。热重曲线的处理使我们能够计算在各种加热速率下聚合物热降解的动力学和热力学参数。在电阻传感器中使用聚[2-(环己基-2-烯-1-基)苯胺]作为敏感材料对环境中的湿度(%RH)和氨浓度的变化表现出较高的电导率响应。提出的结果证明了一种用于PANI改性的有效方法,该方法有利于改善溶解性,改善光致发光性能,并扩大了实际应用范围。
Metal-organic frameworks containing nitrogen-donor ligands for efficient catalytic organic transformations
申请人:The University of Chicago
公开号:US10647733B2
公开(公告)日:2020-05-12
Metal-organic framework (MOFs) compositions based on nitrogen donor-based organic bridging ligands, including ligands based on 1,3-diketimine (NacNac), bipyridines and salicylaldimine, were synthesized and then post-synthetically metalated with metal precursors, such as complexes of first row transition metals. Metal complexes of the organic bridging ligands could also be directly incorporated into the MOFs. The MOFs provide a versatile family of recyclable and reusable single-site solid catalysts for catalyzing a variety of asymmetric organic transformations. The solid catalysts can also be integrated into a flow reactor or a supercritical fluid reactor.
Direct N-alkylation of amines with alcohols was successfully performed by using nanosized zeolite beta, which showed the highest catalytic activity among other conventional zeolites. This method has several advantages, such as eco-friendliness, moderate to high yields, and simple work-up procedure. The catalyst was successfully recovered and reused without significant loss of activity and only water is produced as co-product. In addition, imines were also efficiently prepared from the tandem reactions of amines with 2-, 3- and 4-nitrobenzyl alcohols using nanosized zeolite beta.
作者:Raymond T. Gephart、Daria L. Huang、Mae Joanne B. Aguila、Graham Schmidt、Andi Shahu、Timothy H. Warren
DOI:10.1002/anie.201201921
日期:2012.6.25
A β‐diketiminato copper(I) catalyst enables CHamination of anilines employing low catalyst loadings to preclude oxidation to the diazene ArNNAr (see scheme). Electron‐poor anilines are particularly resistant towards diazene formation and participate in the amination of strong and unactivated CH bonds. N‐alkyl anilines also take part in CHamination.
Nitro-Power! An exceptionally general electrophilicamination of zinc organyl compounds was developed, and yields alkylated aromatic aminoboranes from commercially available nitroarenes. The partially reduced nitro group is directly engaged as an electrophilic nitrogen intermediate. The aminoboranes were reacted with electrophiles, thereby incorporating two different substituents at the N atom of the
Reported herein is a visible-light-catalyzed photoredox atom-transfer radicalcyclization (ATRC) halo-alkylation of 1,6-dienes with α-halo-ketones as the ATRC reagent. This process exhibits high atom economy, high step economy, and high redox economy, which can directly construct a 4-bromo-3,3-dialkyl-octahydro-indol-2-one core under mild conditions in one pot, and lutidine is found to be the key promoter