AB INITIO STUDIES ON THE REACTION MECHANISH OF CYCLOADDITION OF KETENE AND FORMALDEHYDE

来源 :Chinese Chemical Letters | 被引量 : 0次 | 上传用户:mengyidaocaoren
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The cycloaddition reaction of ketene and formaldehyde,lesding to 2-oxetanone,has been studied theoretically by means of RHF/3-21G.This reactionis believed to be nonsynchronous but concerted,taking place through a twistedfour membered ring transition state
其他文献
2018年8月底,陇南市八县一区农产品质量安全检验检测站(中心)项目已经全部建成,并通过省农牧厅组织的竣工验收。本文针对项目建成后运行能力提升问题组织相关人员到基层一线
热熔压敏胶(Hot Melt Pressure Sensitive Adhesive,简称HMPSA)是以热塑性高聚物为基料、集热熔胶和压敏胶的特点于一体,无溶剂、无污染且使用比较方便的一类胶黏剂。采用克拉
A new kind of amphiphilic copolymer was synthesized with azo bond functional side chains, and elementary studies about formation of I,B film, UV-visible spectra
Wittig reaction in methanol was investigated, and a possiblemechanism was proposed.
通过现场采样和实验室模拟加标实验,确立了利用红外光谱法测定车间空气中油雾浓度的方法,并比较了玻璃纤维滤膜和聚四氟乙烯滤膜的采样性能。经研究发现,玻璃纤维滤膜的加标回收
双江口电站在增效扩容改造工程中,由于厂家设计原因,在新机空转试验中发生烧瓦事故。通过对轴瓦集油环槽和水轮机转轮下止水环的改造,经安装、调试、带负荷试运行,现机组运行稳定
大型发电机定子绕组发生接地故障后,不易快速查找确定故障点。文章介绍了一种常用的故障查找方法,从接线原理到现场的应用进行分析,为1号发电机的故障处理提供解决方案。
The effects of various factors on the electrocarboxylation of organic compounds withcarbon dioxide catalyzed by metalloporphyrin are studied.The optimal potenti
Oxidation of ethylbenzene, n-propylbcnzene and n-butylbenzene gives the corresponding ketones and alcohols in good yields by organic polymer supported low—vale
Reaction of ferrocenoyl chloride with [Et<sub>3</sub>NH] [(μ-CO)(μ-RS) Fe<sub>3</sub>=(CO)<sub>?</sub>] complexes gave bridging ferrocenoyl complexes(μ-FcCO)(μ-RS)Fe<