二十个

This work, concentrated on the asymmetric allylation of aldehydes controlled by different chiral auxiliaries prepared from rotational pure tartaric acid, can be divided into three parts.The first part aims to review the developments of chiral drugs and asymmetric synthesis, from which derived the present research topic backgrounds and works.Synthesis and applications of allylation from aldehydes are the second part of the thesis. By optimizing the reaction conditions, such as solvents, temperature, time and chiral auxiliaries like N,N\'-dibenzyl tartamide, N,N\'-p-dimethylphenyl tartamide, N,N\'-o-dimethylphenyl tartamide, N,N\'-o-dichlorophenyl tartamide, N,N\'-a-dinaphyl tartamide, N,N\'-dicyclohexyl tartamide and N,N\'-diphenyl tartamide, ideal experimenttal conditions are obtained according to HPLC monitoring, as well as the auxiliaries\' recoveries experiments. Starting from benzaldehyde and 3-bromopropaldehyde, N,N\'-dibenzyl tartamide is considered the best auxiliary in this reaction.

本文介绍了醛的不对称烯丙基化反应，以光学纯酒石酸为原料，研究了不同构型手性配体在醛的烯丙基化反应中的立体选择性，全文共分三部分十个章节：第一部分对当前手性药物和手性技术进行了概述，并由此展开了本文的研究背景和任务；第二部分为有机合成部分，对醛的不对称烯丙基化反应进行了深入探讨，以苯甲醛为原料对反应条件进行优化，在优化的反应条件下对制备的七种可回收手性酰胺配体(N-苄基酒石酸二酰胺、N-对甲苯基酒石酸二酰胺、N-邻甲苯基酒石酸二酰胺、N-邻氯苯基酒石酸二酰胺、N-a-萘基酒石酸二酰胺、N-环己基酒石酸二酰胺和N-苯基酒石酸二酰胺)进行筛选，优化配体回收实验条件，最终确定出N-苄基酒石酸二酰胺在苯甲醛的不对称烯丙基化反应中具有较大优越性，结晶回收的手性配体光学纯度保持不变。

Results11 separated constituents were identified, the contents of 3 compounds were over 20%. The main constituents in extracts were Bis(2-ethylhexyl) phthalate (21.51%), Nonacosane (25.73%), Stigmastan-3,5-dien (25.73%).

结果从海南裂叶山龙眼叶超临界二氧化碳20 MPa压力提取物中共分离出11个组分，全部进行了鉴定，其中含量高于20%的有3个，为邻苯二甲酸二(2-乙基己基)酯（21.51%）；二十九碳烷（25.73%）；3，5-二烯豆甾烷（25.73%）。

September through December, our ninth through twelfth months, were originally positioned as the seventh through tenth months (septem is Latin for "seven," octo is "eight," novem is "nine," and decem is "ten").

从九月份到十二月份，也就是我们的第九个月到第十二个月，起初被定为从第七到第十个月（拉丁语的&septem&意思是七，&octo&意思是八，&novem&意思是九）。

Sometimes I thought if digging a hole under the place where theymade their fire, and putting in five or six pounds of gunpowder,which, when they kindled their fire, would consequently take fire,and blow up all that was near it: but as, in the first place, Ishould be unwilling to waste so much powder upon them, my storebeing now within the quantity of one barrel, so neither could I besure of its going off at any certain time, when it might surprisethem; and, at best, that it would do little more than just blow thefire about their ears and fright them, but not sufficient to makethem forsake the place: so I laid it aside; and then proposed thatI would place myself in ambush in some convenient place, with mythree guns all double-loaded, and in the middle of their bloodyceremony let fly at them, when I should be sure to kill or woundperhaps two or three at every shot; and then falling in upon themwith my three pistols and my sword, I made no doubt but that, ifthere were twenty, I should kill them all.

这时，我已怒不可遏了，但还是强压心头的怒火，往回走了二十多步，来到一片矮树丛后面。靠着这片矮树丛的掩护，我一直走到那棵大树背后。那里有一片小小的高地，离那些野人大约有八十码远。我走上高地，把他们的一举一动看得清清楚楚。事情已发展到万分紧急的关头了，因为我看到有十九个野人挤在一起坐在地上，他们派出另外两个野人去宰杀那可怜的基督徒。看来，他们是要肢解他，一条胳膊一条腿地拿到火上去烤。我看到那两个野人这时已弯下腰，解着那白人脚上绑的东西。我转头对星期五说：&听我的命令行动。&星期五说他一定照办。我就说：&好吧，星期五，你看我怎么办就怎么办，不要误事。&于是，我把一支短枪和一支乌枪放在地下，星期五也跟着把他的一支鸟枪和一支短枪放在地下。我用剩下的一支短枪向那些野人瞄准，并叫星期五也用枪向他们瞄准。然后，我问星期五是否准备好了，他说：&好了。&

And forty sockets of silver he made under the twenty boards two sockets under one board for his two tenons, and two sockets under another board for his two tenons.

36：23 帐幕的南面作板二十块。36：24 在这二十块板底下又作四十个带卯的银座，两卯接这块板上的两榫，两卯接那块板上的两榫。

Zheng He fleet is "chop wood for the disk, the book's characters engraved Heavenly Stems and Earthly Branches, the needle floating in water, point to The Spectacle of Boats Sailing" is used in water gyrocompass, the Heavenly Stems, Earthly Branches, baguazhang, formed with the five elements, divided into 20 four different directions, if the needle and then taken into account, a total of 48 directions, each the equivalent of a modern compass azimuth 15 degrees, a total of 360 degrees, which the ancients used to guide navigation course has been quite a precise.

郑和船队是&斫木为盘，书刻干支之字，浮针于水，指向行舟&，用的正是水罗经，有天干、地支、八卦、五行配合而成，分有二十四个不同方位，如果再把缝针计算在内，一共四十八个方向，每一方位相当于现代罗盘的十五度，共三百六十度，这在古人航海中用以指导航向已颇为精确了。

The company Production of paper machinery, Winder, coating machine, iron alloy Dryer, such as 18 series, more than 80 kinds of specifications of products, from paper pulp and paper-making to the deep-processing, met the leading domestic level, sales of the two More than 10 provinces and cities and exported to Indonesia, Sudan and other countries.

该公司生产的造纸机械、复卷机、涂布机、合金铸铁烘缸等十八个系列，八十多种规格产品，从制浆抄纸到纸深加工，均达到国内领先水平，产品销售全国二十多个省市，并远销印尼、苏丹等国家。

He noted the claims of the striking motormen and conductors, who said that they had been wont to receive two dollars a day in times past, but that for a year or more "trippers" had been introduced, which cut down their chance of livelihood one-half, and increased their hours of servitude from ten to twelve, and even fourteen.

他注意到了罢工的司机和售票员提出的要求。他们说，过去他们一直拿着2块钱一天的工资，但是最近一年多来，出现了&临时工&，他们谋生的机会就随之减少了一半，而劳作的时间却由十个小时增加到了十二个小时，甚至是十四个小时。

We believe that these know there are confusion and misunderstanding: the Han dynasty with six, the number one or two are actually composed of Yin and Yang Yao Yi Gua 64 hexagrams of the other kind of painting writing, it is not appropriate to "double-digit Gua" Moreover, he pre - avowed; so-called "10 digital hexagrams" If Mr.

已知崧泽文化中的数字卦虽然没有将二、三、四归并入一、六两数，但它们显然也不可能是徐先生所论&四万六千六百五十六个重卦，二十七万九千九百三十六爻&那种数字卦。

Glutamate the leading products sold more than 30 major manufacturers MSG, monosodium glutamate Ferrer won the "prestigious Shandong" and "China's famous condiment brand reputation," the title, sells more than 20 provinces and cities and regions, Huang original Plastic has been sold to India, Indonesia, Pakistan, Oman, Saudi Arabia, Brazil, Mexico, Germany, the United Arab Emirates, the United States, Russia, Canada, Peru, more than 40 countries and regions.

主导产品谷氨酸销往全国三十多个主要味精生产厂家，福瑞味精荣获&山东名牌&和&中国知名调味品信誉品牌&称号，销往全国二十多个省市和地区，黄原胶已销往印度、印尼、巴基斯坦、阿曼、沙特阿拉伯、巴西、墨西哥、德国、阿联酋、美国、俄罗斯、加拿大、秘鲁等四十多个国家和地区。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。