Rearrangements of the carbanions derived from allyl benzyl thioether

The metalation of allyl benzyl thioether involves the benzylic or the allylic hydrogens. The benzylic carbanion undergoes a rapid[2,3] sigmatropic shift whereas the allylic carbanion gives rise to various rearrangements, among them migration of the allylic unit to the para position with allylic inversion. The temperature dependence of the ratio of products arising from the benzylic carbanion vs those from the allylic carbanion shows that the allylic-to-benzylic carbanion transformation occurs only under special conditions: (a) with slow addition of the base; (b) with thioether in excess relative to the base, and (c) on raising the temperature of the reaction medium from ?78° to ?15°. In the last instance, the proton transfer is intramolecular as shown with labeled thioethers. The extent of the different rearrangements depends on the temperature and solvent. A choice of mechanism cannot be made at this time for the para migration 5→9a. A leaving group effect on the reaction regioselectivity of the carbanion from allyl methyl thioether with benzyl halides has been noticed. The presence of dibenzyl indicates that, in addition to S_N2 reactions, some electron transfer process is occurring.     

Bibliometric Analysis of the <Emphasis Type="Italic">Journal of Structural Chemistry</Emphasis>

Bibliometric analysis has been carried out for the Journal of Structural Chemistry (JSC) published since 1960 by the Siberian Branch of the Russian Academy of Sciences. All JSC publications which appeared between 1960 and 2002 have been chosen online from the Chemical Abstracts and Science Citation Index databases of the STN International net and analyzed according to topics, authors, affiliations, and other criteria. JSC authors and publications with the largest numbers of citations have been identified. The impact factor has been determined for JSC 2002.Original Russian Text Copyright © 2004 by V. M. Buznik, I. V. Zibareva, V. N. Piottukh-Peletskii, and N. I. Sorokin__________Translated from Zhurnal Strukturnoi Khimii, Vol. 45, No. 6, pp. 1142–1153, November–December, 2004.     

Implementation of traceability – needs and perspective of the in-vitro-diagnosticum industry

Manufacturers support the concept of traceability. However, only a small number of the medically relevant measurands can be traced to the highest metrological order. In many cases, the measured substances are heterogeneous mixtures where traceability can be established only to either an international conventional reference measurement procedure or to a manufacturers own in-house reference system. The traceability concept needs to be seen in the context that the results of medical laboratories are not an aim per se, but are meant to provide useful medical information to clinicians, and that pre- and post-analytical steps may also contribute significantly to errors. There is a need for the further development of suitable reference measurement systems, but in view of the multitude of tasks and limited resources, priorities need to be set.Presented at BERM-9 – 9^th International Symposium on Biological and Environmental Reference Materials, 15–19 June 2003, Berlin, Germany     

我国民营企业文化建设的对策

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中国纺织品对外贸易存在的问题与发展对策

后配额时代的全面启动,使全球纺织经济步入新的增长周期.中国纺织业如何融入国际更精细、更紧密的跨国生产网络之中,进一步促进我国纺织产业和世界纺织经济的对接和融合,加快我国纺织品出口增长方式的转变,推动纺织产业持续、快速、健康地发展,是国内外纺织业面临的共同问题.本文分析了我国纺织品对外贸易存在的问题和不足,提出了在后配额时代发展纺织品贸易的对策.     

突破国人对外谈判障碍应用策略浅析

中国加入WTO，企业将面临着更多的机遇与挑战。商务谈判与协商成为国际商务活动的中心环节。为了在谈判中争取主动，顺利地驾驭谈判过程，就要求我国的谈判人员对自身的谈判理论、原则、策略与方法进行不断的调整与改进。     

一种扩展了价格变迁的Petri网及应用

提出一种扩展了价格变迁的Petri网一经济Petri网，讨论了相应的分析方法，并用经济Petri网建立一个业务流程的费用模型。得出的结论包括：为Petri网扩展价格变迁是可行的：将经济Petri网应用于业务流程管理领域是有效的。     

国有商业银行中间业务发展滞后的分析

通过建立模型，系统分析了国有商业银行产品供求矛盾的原因，以及信息不对称造成中间业务产品风险增大，产品创新动力不足，并对国有商业银行中间业务的发展提出了相应的对策和建议。     

从测绘管理谈"注册测量师"的构建

给出了“注册测量师”的定义,指出市场运行需要“注册测量师”,提出实施测量师制度与国际接轨是经济发展的需要。     

用知识管理构建电子商务实验教学体系

文章提出用知识管理构建电子商务实验教学体系的观点，就电子商务实验教学体系的建设中，如何构建学习组织、学习系统的思想和方法，进行知识交流与共享．运用知识管理进行实验创新，进行了相应的探讨．