Sulfonated nanohydroxyapatite functionalized with 2-aminoethyl dihydrogen phosphate (HAP@AEPH2-SO3H) as a reusable solid acid for direct esterification of carboxylic acids with alcohols
catalyzed direct esterification of carboxylicacids and alcohols with high selectivity toward the formation of esters in good to excellent yields. Our results clearly show that HAP@AEPH2-SO3H can be easily recovered by simple filtration and reused for subsequent five runs without any significant impact on yields of products. The main advantage of this methodology is easy and ecofriendly catalyst preparation
Synthesis of ZSM-5 monoliths with hierarchical porosity through a steam-assisted crystallization method using sponges as scaffolds
作者:Tiejing Hu、Jian Liu、Changyan Cao、Weiguo Song
DOI:10.1016/s1872-2067(17)62828-6
日期:2017.5
Abstract Self-supporting ZSM-5 crystals with hierarchicalporosity were prepared through a steam-assisted crystallization method using sponges as rigid scaffolds. The synthesized materials were characterized by X-ray diffraction, nitrogen sorption, scanning electron microscopy, transmission electron microscopy, solid-state nuclear magnetic resonance spectroscopy and ammonia temperature-programmed desorption
Acceptorless Dehydrogenative Cross-Coupling of Primary Alcohols Catalyzed by an N-Heterocyclic Carbene–Nitrogen–Phosphine Chelated Ruthenium(II) Complex
The acceptorless dehydrogenativecross-coupling of primaryalcohols to form cross-esters with the liberation of H2 gas was enabled using a [RuCl(η6-C6H6)(κ2-CNP)][PF6]Cl complex as the catalyst. This sustainable protocol is applicable to a broad range of primaryalcohols, particularly for the sterically demanding ones, featuring good functional group tolerance and high selectivity. The good catalytic
使用 [RuCl(η 6 -C 6 H 6 )(κ 2 -CNP)][PF 6 ]Cl 络合物,可以实现伯醇的无受体脱氢交叉偶联以形成交叉酯并释放 H 2气体催化剂。这种可持续的协议适用于广泛的伯醇,特别是对于空间要求高的伯醇,具有良好的官能团耐受性和高选择性。良好的催化性能可归因于氮-膦功能化的N-杂环卡宾(CNP)配体,它采用面配位模式以及配位苯的容易解离。
Tunable directional color transition compositions and methods of making and using the same
申请人:Segan Industries, Inc.
公开号:US10168307B1
公开(公告)日:2019-01-01
Color change compositions that transition from a first to second color state upon application of an applied stimulus are provided. Also provided are substrates having the compositions on a surface thereof, as well as methods of making and using the compositions.