有机锡试剂在有机合成中的某些新应用

本文阐述有机锡试剂在有机台成巾的一些新应用。在钯催化下,有机锡试剂与亲电试剂进行偶联,条件温和,收率高。有机锡试剂促进醇醛缩合,可用于不对称合成中。     

新负载型试剂在有机合成反应中的应用

本文根据化学工业在 2 1世纪面临的要求———开发创新环境友好工艺 ,介绍了几种新的负载型试剂 ,如固体酸、固体碱等 ,以及它们在某些有机合成反应 ,如Friedel Crafts反应、硝化反应、卤代反应、Michael反应及一系列氧化反应中的应用。     

合成位阻肽的偶合试剂研究

本文综述了合成含N-烷基氨基酸或α,α-二取代氨基酸位阻肽的偶合试剂研究新进展,并对这些新的偶合试剂及偶合方法的优点和不足予以评述。     

合成位阻肽的偶合试剂研究

本文综述了合成含N-烷基氨基酸或α,α-二取代氨基酸位阻肽的偶合试剂研究新进展,并对这些新的偶合试剂及偶合方法的优点和不足予以评述。     

Advances in the Synthesis of New Organic Reagents for the Determination of Noble and Heavy Metals

Results are summarized on the synthesis of reagents for the determination of noble and heavy metals (sulfonitrophenol M, sulfochlorophenolazorhodanine (Rhodazol KhS), chlorophenolazorhodanine (Rhodazol Kh), sulfobenzeneazorhodanines, p-phenolazo-3-aminorhodanine, benzeneazobenzeneazorhodanine, sulfochlorophenolazothiopropiorhodanine (tyrodine), and hexaoxacycloazochrom), methods for their purification and identification, the determination of the concentration of the active compound in reagents, and techniques for the storage of reagents and the preparation of working solutions.     

Polymers as Reagents in Organic Synthesis

Polymeric reagents offer a range of unique advantages. Intramolecular reactions, such as the cyclization of peptides or Dieckmann cyclizations, can be brought about by attaching the reactive molecules at remote points along a polymer chain. In contrast, if the reactive molecules are anchored in close proximity on a polymeric support then intermolecular reactions occur, as demonstrated for a ketone synthesis. Apart from such proximity effects, cooperative effects can also be exploited, e.g. in the formation of a 2:1 complex of a crown ether and an alkali metal ion. The hydrolysis of an ester with polyvinylimidazole provides a detailed illustration of hydrophobic interactions. The simple separation of polymer-bound and low-molecular compounds by filtration is another significant advantage.     

Applications of Polymeric Reagents in Organic Synthesis

Summary. Polymer supported reagents have found many applications in recent years. Scientists in research laboratories of agrochemical and pharmaceutical industries now routinely utilize these compounds to prepare ensembles of small organic molecules for screening. This review is aimed to highlight some of the most important applications of these promising materials in organic synthesis. Furthermore, an extensive listing of polymeric reagents that were recently used in organic synthesis is included.     

Applications of Polymeric Reagents in Organic Synthesis

Polymer supported reagents have found many applications in recent years. Scientists in research laboratories of agrochemical and pharmaceutical industries now routinely utilize these compounds to prepare ensembles of small organic molecules for screening. This review is aimed to highlight some of the most important applications of these promising materials in organic synthesis. Furthermore, an extensive listing of polymeric reagents that were recently used in organic synthesis is included.     

钐试剂在有机合成中的应用

本文综述了钐试剂在有机合成中的应用,包括还原反应,碳-碳键形成反应以及催化作用。     

有机试剂结构与性质的研究XII有机试剂的pKa与改进的Swain－Lupton参数

有机试剂的ｐＫ０ａ是其重要的物化参数，它是有机试剂酸碱性的度量，决定其配合物的稳定性．根据Ｓｗａｉｎ－Ｌｕｐｔｏｎ的工作，每个取代基的效应可用两个参数：场／诱导效应参数与共振效应参数来描述．本文应用Ｈａｎｓｃｈ改进的参数值研究了ｐＫａ与取代基常数的相关性，建立了下式．ｐＫａ＝ｐＫ０ａ＋ｒ１Ｆ＋ｒ２Ｒ     

Rediscovering Sulfinylamines as Reagents for Organic Synthesis

Sulfinylamines (R−N=S=O), monoaza analogues of sulfur dioxide, have been known for well over a century, and their reactivity as sulfur electrophiles and in Diels-Alder reactions is well-established. However, they have only rarely been used in organic synthesis in recent decades despite the increasing prominence of compounds containing N=S=O functionality, such as sulfoximines and sulfonimidamides. This Minireview aims to bring wider visibility to the unique chemistry enabled by this class of compounds. We focus on advances from the last 10 years, including the first examples of their use in the one-pot syntheses of sulfoximines and sulfonimidamides. Also covered are the reactions of sulfinylamines with carbon-centred radicals, their use for formation of heterocycles through cycloadditions, and catalytic enantioselective allylic oxidation of alkenes via a hetero-ene reaction. These examples highlight the different reactivity modes of sulfinylamines and their underappreciated potential for forming molecules which contain high- or low-valent sulfur, or even no sulfur at all.     

Palladium-Catalyzed Organic Reactions Involving Hypervalent Iodine Reagents

The chemistry of polyvalent iodine compounds has piqued the interest of researchers due to their role as important and flexible reagents in synthetic organic chemistry, resulting in a broad variety of useful organic molecules. These chemicals have potential uses in various functionalization procedures due to their non-toxic and environmentally friendly properties. As they are also strong electrophiles and potent oxidizing agents, the use of hypervalent iodine reagents in palladium-catalyzed transformations has received a lot of attention in recent years. Extensive research has been conducted on the subject of C—H bond functionalization by Pd catalysis with hypervalent iodine reagents as oxidants. Furthermore, the iodine(III) reagent is now often used as an arylating agent in Pd-catalyzed C—H arylation or Heck-type cross-coupling processes. In this article, the recent advances in palladium-catalyzed oxidative cross-coupling reactions employing hypervalent iodine reagents are reviewed in detail.     

有机硅试剂在药物合成中的应用

主要介绍了有机硅试剂作为保护剂对药物结构中含有羟基、羧基、不饱和键、氨基、羰基和其它官能团的保护及应用情况,以及在合成中间体烯醇硅醚等方面的应用.     

Liquid-Phase Oxidation of Organic Reagents in Inorganic Analysis

It was shown that the sensitivity of analytical procedures using organic reagents can be significantly increased if a poorly soluble complex of an element with an analytical reagent is oxidized to the products of complete oxidation of organic compounds (CO₂, H₂O, and NH₃or N₂for nitrogen-containing reagents). Knowing the amount of the consumed oxidant, one can easily determine the amount of the organic constituent of the complex and, hence, the amount of the complex-forming element. Vanadium salts were proposed as oxidants. The effects of medium acidity, oxidant concentration, time of heating, and temperature on the completeness of oxidation were studied. Based on the results obtained, it was demonstrated for a number of organic compounds that liquid-phase oxidation is highly promising and that trace amounts of elements can be determined by conventional titrimetric methods. The determination of phosphorous with diantipyrylmethane is illustrated by an example (1 mL of a 0.1 M vanadate solution corresponds to 10 g phosphorous).     

固载氧化剂在有机合成中的应用

对近15年来主要的固载氧化剂在有机合成中的应用进行了综述。参考文献71篇。     

有机试剂在头发消化过程中的作用研究

利用有机试剂对蛋白质和油脂的作用,建立了一种不需加热的快速有效消化头发的新方法,并对其作用机理进行了探讨。