[目的]制备多种酰胺类农药的一个重要中间体N-羟甲基-2-三氟甲基苯甲酰胺。[方法]以邻三氟甲基苯甲醛为起始原料,经氧化反应得到邻三氟甲基苯甲酸,然后与氯化亚砜、氨气经氯化及胺化得到邻三氟甲基苯甲酰胺,最后经羟甲基化得到N-羟甲基...[目的]制备多种酰胺类农药的一个重要中间体N-羟甲基-2-三氟甲基苯甲酰胺。[方法]以邻三氟甲基苯甲醛为起始原料,经氧化反应得到邻三氟甲基苯甲酸,然后与氯化亚砜、氨气经氯化及胺化得到邻三氟甲基苯甲酰胺,最后经羟甲基化得到N-羟甲基-2-三氟甲基苯甲酰胺。目标化合物及中间体结构经1H N M R确证。[结果]反应总收率66.6%,产品含量98.5%。[结论]该工艺收率高,操作简单,可为工业化生产提供参考。展开更多
Lyocell fibers are subject to fibrillate under wet conditions, which severely affects the appearance of this kind of fabrics. Cross-Unking treatment is an important way to prevent fibrillation of lyocell fibers. In th...Lyocell fibers are subject to fibrillate under wet conditions, which severely affects the appearance of this kind of fabrics. Cross-Unking treatment is an important way to prevent fibrillation of lyocell fibers. In this study, two kinds of traditional N-hydroxymethyl cross-linking agents were used to treat lyocell fibers and the wet abrasion values of lyocell fibers were measured in a wet abrasion test. The results show the wet abrasion values of lyocell fibers increase with the increasing concentration of the cross-linking agents, which indicates the anti-fibrillation property of the treated fibers has been improved. But the mechanical properties of the treated fibers decreased in some extent. The FT-IR spectroscopy analysis shows that the lyocell fibers have cross-linked with cross-linking agents. The SEM analysis results show the fibers treated by 4% DMDHEU or 5% SECO have good anti-fibrillation properties.展开更多
A method for the determination of N-hydroxymethyl nicotinamide by spectrophotometry is described.N-hydroxymethyl nicotinamide was converted to acetate by acid-catalyzed acetylation,followed by base- catalyzed hydroxam...A method for the determination of N-hydroxymethyl nicotinamide by spectrophotometry is described.N-hydroxymethyl nicotinamide was converted to acetate by acid-catalyzed acetylation,followed by base- catalyzed hydroxamation of the acetate ester and color development as the ferric hydroxamate chelate.The resulting colour solution was measured at 524nm,Beer's law is obeyed in the concentration range of 1--8x10^(-3) mol/L N- hydroxymethyl nicotinamide.展开更多
文摘[目的]制备多种酰胺类农药的一个重要中间体N-羟甲基-2-三氟甲基苯甲酰胺。[方法]以邻三氟甲基苯甲醛为起始原料,经氧化反应得到邻三氟甲基苯甲酸,然后与氯化亚砜、氨气经氯化及胺化得到邻三氟甲基苯甲酰胺,最后经羟甲基化得到N-羟甲基-2-三氟甲基苯甲酰胺。目标化合物及中间体结构经1H N M R确证。[结果]反应总收率66.6%,产品含量98.5%。[结论]该工艺收率高,操作简单,可为工业化生产提供参考。
文摘Lyocell fibers are subject to fibrillate under wet conditions, which severely affects the appearance of this kind of fabrics. Cross-Unking treatment is an important way to prevent fibrillation of lyocell fibers. In this study, two kinds of traditional N-hydroxymethyl cross-linking agents were used to treat lyocell fibers and the wet abrasion values of lyocell fibers were measured in a wet abrasion test. The results show the wet abrasion values of lyocell fibers increase with the increasing concentration of the cross-linking agents, which indicates the anti-fibrillation property of the treated fibers has been improved. But the mechanical properties of the treated fibers decreased in some extent. The FT-IR spectroscopy analysis shows that the lyocell fibers have cross-linked with cross-linking agents. The SEM analysis results show the fibers treated by 4% DMDHEU or 5% SECO have good anti-fibrillation properties.
文摘A method for the determination of N-hydroxymethyl nicotinamide by spectrophotometry is described.N-hydroxymethyl nicotinamide was converted to acetate by acid-catalyzed acetylation,followed by base- catalyzed hydroxamation of the acetate ester and color development as the ferric hydroxamate chelate.The resulting colour solution was measured at 524nm,Beer's law is obeyed in the concentration range of 1--8x10^(-3) mol/L N- hydroxymethyl nicotinamide.
