N,N-二烯丙基甲基胺的相转移催化合成

相转移催化剂;聚乙二醇-400;N;N-二烯丙基甲基胺的相转移催化合成     

相转移催化合成硫氰酸铵

以氨和二硫化碳为原料的传统合成硫氰酸铵 ( NH4 SCN)工艺分为加压法 [1,2 ]和常压法 [3,4 ] 2种 .常压法设备投资小 ,操作灵活 ,但常压因互不相溶的 CS2 、NH3两相反应体积小 ,速度慢 ,反应时间达 2 5 h以上 ,且 CS2 易挥发 ,使 NH4 SCN产率仅有 60 %左右 .表面活性剂作为相转移催化剂加快反应速度的应用已有报道 [5] .本文采用壬基酚四氧乙烯醚 ( OP- 4)和壬基酚二十一氧乙烯醚 ( OP- 2 1 )混合型催化剂用于 n( CS2 )∶ n( NH3) =1∶ 2 .5反应体系 ,在常温、常压及高速搅拌下 ,第 1步反应缩短为 4h,NH4 SCN产率提高到 70 %以…     

Synthesis of Hydroxypropyl Guar Gum by Phase Transfer Catalysis

HGG (Hydroxypropyl guar gum) was synthesized by phase transfer catalysis for the first time. The effects of alkalinity, phase transfer catalyst, etherification, pH value, temperature,reaction time and stirring speed were investigated. An optimal synthetic reaction technology was established, namely, dose of guar gum is 100 g, propylene oxide 40-50 g, HTAC (hexadecyl trimethyl ammonium chloride ) 1.3-1.7 g, pH value 10-10.5, temperature 45-50~C, and reaction time 3-4 hours. The result shows that the improved HGG has high viscosity. Its dissolution speed, content of insoluble residue, colloid light transparency and stability are apparently superior to guar flour.     

相转移催化合成1-丁氧基-4-硝基苯

在ＫＯＨ存在下,以Ｂｕ４Ｎ＾＋Ｂｒ－（ＴＢＡＢ）为相转移内化剂,由对硝基氯苯和正丁醇合成了１－丁氧基－４－硝基苯。讨论了催化剂、碱和反应温度等因素的对反应的影响,实验确定最佳的投料摩尔比为;对硝基氯苯（ＰＣＮＢ）：正丁醇：ＫＯＨ（５０％）：ＴＢＡＢ＝１：１．３：１．５：０．０３。在最佳实验条件下,产品收率为８７．５％,纯度经液色谱分析可达９５％。     

A Facile Synthesis of Unsymmetrical Sulfides Under Phase Transfer Conditions

An efficient synthesis of unsynmetrical sulfides (3) is described by reacting S-alkylisothiouroniu″ salts (1) with alkyl halides (2) under liquid-liquid phase transfer catalyst conditions.     

Synthesis of Substituted Diphenylamines Under Phase Transfer Catalysis

A convenient procedure for the synthesis of N-[(trifluoromethyl) nitrophenyl] substituted anilines by means of a chloro-substitution reaction under conditions of phase-transfer catalysis (PTC) is reported. The ipso-substitution product is obtained with high yield. This method provides a general procedure for the synthesis of diphenylamines bearing electron-withdrawing groups in both aromatic rings.     

Synthesis of Alkyl Bromide by the Method of Phase Transfer Catalysis

Phase transfer catalysis is one of the most active techniques used in organic synthesis^[1]. The process is versatile, fast, inexpensive, involves smooth work-up, give good yield and needs less drastic condition compared to conventional methods of synthesis. The technique has a very broad scope of application^[2], surprised, few are have been devised for synthesizing alkyl bromides. Alkyl bromides are important materials in organic synthesis and in agricultural chemical purpose, as well as widely used in the oil field gas exploration and water treatment^[3].     

相转移催化二苯美仑类化合物的合成

以苯甲醇、苯酚为起始原料,在催化剂活性Al2O3存在下,通过Claisen重排反应得到关键中间体2-苄基苯酚,利用相转移催化技术进行醚化反应后,再经过胺化、酸化反应合成得到一种新型结构的二苯美仑类化合物。反应过程经优化使中间体2-苄基苯酚产率较文献提高8%,反应总收率64.7%。合成产物化学结构经红外光谱、核磁共振、质谱、元素分析得到确证。     

The Synthesis of Symmetrical Azobenzenes from Anilines by Phase Transfer Catalysis

Azobenzeneshavebeenwidelyutilizedasdyesandanalyticalreagents'.Theycanals0beusedasmaterialofnon-linearoptics,0pticinformationstoringmateriaIinlaserdiskanddyeswithoilsolubilityinphotochromyinmoderntechnol0gy"'.TheoxidationofsubstitutedsemicarbazidestoazocompoundswithseveralreagentssuchasNBS(N-bromosuccinimide)/pyridine',KClO,M,S0'NeS0",DMF-NO.'and2,4,6-(t-C'H,),C,H,OWh,Fe(CN),/Nhasbeenreportedbyus.The0xidationofsubstitutedanilinestoazobenzeneswithavarietyofreagentssuchasphenyli0d0acet…     

Synthesis of N-Alkylpyrazoles by Phase Transfer Catalysis Without Solvent Without Solvent

The alkylation of pyrazole is performed by phase transfer catalysis without solvent. High yields of N-alkylpyrazoles are obtained and the principal problems in the alkylation are suitably solved.     

逆向相转移催化在有机合成中的应用

系统地总结了逆向相转移催化在有机合成中的应用,逆向相转移催化的作用在于逆向相转移催化剂能将底物分子从有机相转移至水相中发生反应,着重介绍了几种典型的逆向相转移催化剂如吡啶及其衍生物;杯芳烃;环糊精及其衍生物,水溶性过渡金属配合物在有机合成中的应用。     

超声辐射和相转移催化下肟苄醚的合成

在超声辐射和苄基十四烷基二甲基氯化铵作用下, 肟和苄基溴在NaOH水溶液中于室温反应30～60 min, 肟苄基醚的收率60%～96%, 反应时间短, 收率高, 对环境友好.     

相转移催化法合成双酚S型聚芳酯的研究

本文报道了用相转移催化法合成双酚S型聚芳酯的实验结果,对聚合条件进行了讨论。结果表明,用季胺盐作相转移催化剂,在30℃下可以得到高分子量的产物。这种双酚S型聚芳酯具有较好的透明度,优异的电性能,甚至在150℃下,力学性能也很好。可见光透过率87%;室温屈服强度637kg/cm²;T₈208℃;介电常数击;穿电3.6压150kV/mm。     

相转移催化法合成对位和间位苯二甲酰基硫脲衍生物

酰基硫脲化合物;相转移催化合成;相转移催化法合成对位和间位苯二甲酰基硫脲衍生物     

Synthesis of Aromatic Polyesters Bearing Pendant Carboxyl Groups by Phase Transfer Catalysis

Aromatic polyester (PEA) and copolyesters having pendant carboxyl groups aredirectly synthesized from isophthaloyl chloride, diphenolic acid and diols byaqueous/organic two-phase interfacial polycondensation, using phase transfercatalysts. The yield and molecular weight of the polyester were remarkablyaffected by the structure of quaternary ammonium salts and crown ether catalysts.The phase transfer reaction steps are suggested to explain this phenomena. Theproperties of copolyesters were dependent on the original structure of diols.     

逆相转移催化

主要介绍一种国内未见专题报道的逆相转移催化 (InversePhaseTransferCatalysis ,简称IPTC)技术 ,介绍该技术的定义、特点及典型应用     

二乙烯苯交联聚(2-羟乙基硫甲基苯乙烯)树脂的相转移催化合成

 研究了固-液-液体系中相转移催化的交联氯甲基化聚苯乙烯与2-巯基乙醇的反应,合成了一种含有硫和氧的新型螯合树脂二乙烯苯交联聚(2-羟乙基硫甲基苯乙烯)(PSME). 用FT-IR监测手段,研究了反应时间、反应温度、相转移催化剂、溶剂极性以及反应物摩尔比对转化率的影响. 结果表明,当温度为298 K,2-巯基乙醇与氯甲基化聚苯乙烯的摩尔比为6,十四烷基三甲基溴化铵为相转移催化剂时,在苯/NaOH水溶液中氯的转化率可达到91.2%. 用FT-IR,XPS,EDX,SEM和元素分析法对树脂的结构进行了表征,引入功能基之后,树脂的孔隙明显增大.     

Synthesis of Sulfoxides by Phase Transfer Catalyzed Oxidation of Sulfides by Cerium(IV) Ammonium Nitrate

Diaryl, dialkyl and alkyl aryl sulfides are oxidized by cerium (IV) ammonium nitrate in H₂ O/CH ₂ Cl ₂, in the presence of tetra-n-butylammonium bromide, at room temperature, to give sulfoxides in yields ranging between 90 and 100%.     

Synthesis of 3,4‐Dihydropyrimidinones via Phase Transfer Catalysis

3,4‐Dihydropyrimidinone and derivatives were synthesized by the one‐pot, three‐component Biginelli condensation of an aldehyde, β‐dicarbonyl compound and urea. Synthesis was carried out in aqueous sodium hydroxide using Aliquat‐336 as a phase transfer agent. Compared to the classical Biginelli reaction conditions, this new method cousistently has the advantage of excellent yields and short reaction time.     

相转移催化合成酯基取代酞菁铜及其光导性能

酞菁配合物的大π键共轭体系使其具有独特的物理化学性能．但酞菁的难溶性,限制了其进一步的研究和应用．Baker等首次制备了可溶性酞菁单分子膜,并将其应用到光电池中;随后,已有大量的相关研究报道．作为常见的可溶性酞菁衍生物,酯基取代酞菁由于含酯基的前体物质高温分解而不能采用直接缩合的方法,