逆相转移催化技术的研究进展

概述了逆相转移催化的机理和特点,对目前已知的几种主要的逆相转移催化剂如吡啶类、环糊精类、杯芳烃类等进行了详细介绍,并分析了逆相转移催化技术的研究和应用现状,指出了目前存在的主要问题,同时展望了其发展趋势。     

相转移催化Darzens反应的研究进展

综述了两类相转移催化剂季铵盐和冠醚在Darzens反应中应用的最新进展.     

相转移催化合成溴代环戊烷

以液－液相转移催化合成溴化环戊烷。考察了不同的相转移催化剂、催化剂用量、反应温度和时间、反应物料的配比对合成溴环戊烷的影响。确定了合成溴代环戊烷的适宜条件。     

相转移催化技术在无机化工中的拓展

相转移催化理论一直应用于有机物的合成领域。相转移催化技术也可用于无机盐水溶液或固态盐类与有机物之间的液—液和固—液多相反应。将相转移催化技术理论首次拓展到无机难溶盐之间的固—固类型转化反应中 ,利用此技术 ,可从生产硼砂的废渣硼泥中提取出轻质碳酸镁 ,为硼泥的综合利用提供了一条经济、切实可行的途径     

水杨醛的相转移催化合成研究

制备了新型系列高聚物相转移催化剂,并将其应用于水杨酸的合成反应中,结果表明,在一定条件下,该系列催化剂之一LIB对水杨酸的合成具有较好的催化活性。     

相转移催化法合成乙酸苄酯的研究进展

本文简要介绍了乙酸苄酯的应用、性能特点及合成方法,着重阐述了合成乙酸苄酯的相转移催化原理及目前国内相转移催化合成乙酸苄酯的研究现状。     

相转移催化Reimer-Tiemann法反应合成对羟基苯甲醛的研究进展

对羟基苯甲醛是一种十分重要的精细化工原料,其合成方法较多.其中的Reimer-Tiemann法反应机理明确、原料价格低廉易得、设备要求低,采用相转移催化剂后可有效减少副产物并提高产率.     

相转移催化法合成三甲基氯硅烷

介绍了三甲基氯硅烷的四种制备工艺,研究了在特殊催化剂存在下适合工业化生产的工艺路线,对旧工艺进行了改进,详细研究了本工艺的原料配比、溶剂用量和反应温度对收率的影响,使收率达到95%以上。     

有机反应中的相转移催化剂

文章综述了有机合成中的相转移催化剂的反应机理及种类,并展望了相转移催化剂的发展趋势。     

相转移催化法合成糖苷类化合物的研究进展

相转移催化法具有操作简便,反应速度快,反应条件温和,后处理简单和立体选择性强等优点。近年来相转移催化法广泛应用于糖苷类化合物的合成。综述了相转移催化法所用的各类相转移催化剂(季铵盐类、叔胺类等)在糖苷类化合物合成中的应用,指出季铵盐类催化剂应用最为广泛。     

Halogenation by Phase Transfer Catalysis

Several ketones have been halogenated with carbon tetrachloride employing basic phase transfer catalytic conditions. Acetophenone and phenylace-tone yield halogenated epoxides while several other aromatic compounds underwent α-oxidation.     

Phase Transfer Catalysis in Phosphorus Chemistry

Phase-transfer catalysis (PTC) has been widely used for the synthesis of organic compounds for more than three decades. The scope and mechanistic features of PTC have been the aim of numerous studies. This review focuses on the application of phase transfer catalysis in synthesis of phosphorus compounds.     

Metal Carbonyls in Phase Transfer Catalysis

This review is limited to phase transfer systems (solid—liquid and liquid—liquid) involving metal carbonyls. The principles of phase transfer catalysis, related to metal carbonyl properties which play a key role in these two-phase systems, are first briefly recalled. Then, in the light of these principles, applications to inorganic chemistry (ligand exchange, preparation of metal carbonyl anions), organometallic chemistry (synthesis of π allyl complexes, clusters, orthometalated compounds, acylmetal carbonyls, complexed ylids), and finally to organic chemistry are comprehensively reviewed. In this last part, both stoichiometric and catalytic systems (with respect to the metal carbonyl) are reviewed essentially in the fields of functional reduction and carbonylation.     

Insight into Green Phase Transfer Catalysis

There is a need to develop green, clean and smart chemical technologies. Waste reduction through clever strategies and catalysis are at the heart of green chemistry. In the case of over 600 industrial phase transfer catalyzed (PTC) processes in several industries, mostly practised as liquid–liquid PTC, the catalyst is not recovered and disposed as a waste. Liquid–liquid PTC can be replaced by solid–liquid (S–L), liquid–liquid–liquid (L–L–L), solid (catalyst)–liquid–liquid, solid–liquid–omega liquid, gas–liquid–solid (G–L–S) and capsule membrane PTC to recover and reuse the catalyst and also to enhance selectivity, thereby advocating the realm of green PTC. Use of microwaves and ultrasound will also help in increasing rates. MILL–PTC and MISL–PTC are attractive techniques to enhance rate and selectivities under mild input of microwave irradiation (MI). In cascade-engineered PTC, several steps are combined in a reactor using the same catalyst and solvent, if used at all, without separation, or with partial replenishment of the reactants for all the steps to get substantial waste minimization. This paper provides a new insight into PTC for some reactions of industrial importance.     

利用相转移催化剂合成刃天青

在相转移催化剂聚乙二醇-600催化下,以间苯二酚为主要原料,经氧化合成刃天青,优化了反应条件,找到对环境更友好、产率较高的合成方法。     

有机合成中的相转移催化作用

随着国家建设发展的不断推进,人们的生活水平得到很大程度的提高,化工行业得到前所未有的发展。在这样的基础上研究有机合成物中的转移催化作用,需要从相应的操作原理进行分析,进而给出具体的应用。