【摘 要】
：
In this paper,obtainment of 3 by simultaneous inversion of configurations of C_(22),C_(23)in 2 via its ditosylate or dimesylate was unsuccessful,leading to eli
【出 处】
：
Acta Chimica Sinica(English Edition)
论文部分内容阅读
In this paper,obtainment of 3 by simultaneous inversion of configurations of C_(22),C_(23)in 2 via its ditosylate or dimesylate was unsuccessful,leading to elimination products instead.However,monotosylate of 2 can be readily obtained with exclusive regioselectivity,which in turn gave a singleepoxide 7b Hydrolysis of 7b gave 3 and 2 is a ratio of 2:1,with a combined yield of 80%.Therecovered 2 can of course be recycled again.
In this paper, obtainment of 3 by simultaneous inversion of configurations of C_ (22), C_ (23) in 2 via its ditosylate or dimesylate was unsuccessful, leading to elimination products instead.However, monotosylate of 2 can be readily obtained with exclusive regioselectivity , which in turn gave a singleepoxide 7b Hydrolysis of 7b gave 3 and 2 is a ratio of 2: 1, with a combined yield of 80%. Therecovered 2 can of course be recycled again.
其他文献
周边液压拉伸法,是利用对向液压拉伸的特点,在凸模下行过程中在材料周边产生液压从而使材料径向应力减小,又由于材料和模具间的液体润滑,使材料的拉伸极限大幅度提高的方法
The formation and the presence of hypervalent Si in the electron donor-acceptor com-plex H_3N·SiH_3 Cl have been investigated by ab initio calculation. The re
2,3,4-Tri-O-benzyl-6-O-trimethylsilyl-α-D-glucopyranosyl bromide reacted with RSHcompounds(R=Et,t-Bu,PhCH_2,p-PhBu~t,Ph,2-benzoxazole,2-benzothiazole),with di
芙蓉铀矿是根据产地命名的,芙蓉国是湖南省的异称,敬引自伟大领袖毛主席的光辉诗句:“芙蓉国里尽朝晖”,以表示我们对伟大领袖和导师毛主席的无限崇敬。芙蓉铀矿产于湖南西
在第15届中国(虎门)国际服装交易会进入高潮之际,组委会迎来了一批特殊的客人,国家级扶贫县张北县人民政府县长戎均文,县委副书记刘河率领张北招商考察团于11月22日—24日,赴
1.电子期刊的著录格式:主要责任者.题名[文献类型标志/文献载体标志,电子文献是必选著录项目,其他文献可选择标注].刊名,年,卷(期):起页-止页[引用日期].获取和访问路径.
陕西秦岭山区,分布有大量的酸性花岗岩岩石。关于花岗岩的成因,多认为是由酸性花岗岩岩浆生成似无问题。紧接着来的就是花岗岩的成矿问题。对于成矿问题,认识不一,有人说有
一、前言 这篇工作报告是关于热处理海洋沉积物中天然存在的酯类和色素类变化的一系列研究的组成部分。为了研究,我们从塔纳盆地(Tanner Basin)选择了沉积物,它是位于加利福
用测井曲线求原煤炭分含量,是当前煤田地质勘探中的迫切任务之一。是开展无岩心钻进的重要前提。为此,我们在邵明及邢北勘探区,开展了应用人工放射性曲线,求原煤灰分含量的
外语视听资料是现代外语教学中对学生进行教学的重要媒体,也是外语教学的重要组成部分,特别是知识新、质量高、感染力强的视听制品,倍受学生青睐。但是,随着时代的发展,知识